2021 Ram 4500 Electrical Connector Parts: OEM & Replacement (97 Parts)

The 2021 Ram 4500 has 97 electrical connector parts with verified fitment on this page — 42 part types and 9 brands, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each part includes a manufacturer part number and application notes.

The connector system on the 2021 Ram 4500 supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Transmission-Automatic Wiring Harness / Connector (11 parts), Trailer Connector (10 parts) and Headlamp Wiring Harness / Connector (9 parts). The other 39 part types cover the remaining 67 parts.

A/C Compressor Clutch Coil Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2052	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalGauge: 18-14 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2052 Connector Shape: OvalGauge: 18-14 GaugeHarness LengthCM: 50Inches: 20	View on Amazon

This table covers the harness connectors at the A/C Compressor Clutch Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

ABS Wheel Speed Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 4500 engines	HP3945	🇺🇸 US 🇨🇦 CA	HandypackConnector Shape: Square Fitment notes — STANDARD MOTOR PRODUCTS HP3945 HandypackConnector Shape: SquareIncludes Wheel Speed Sensor Wiring HarnessBlackIncludes ABS Wheel Speed Sensor Wire Harness Rear Left	View on Amazon
ACDELCO Fits: all 2021 4500 engines	PT2160	🇺🇸 US 🇨🇦 CA	GoldShape: Square Fitment notes — ACDELCO PT2160 GoldShape: Square Rear Left	View on Amazon
DORMAN Fits: all 2021 4500 engines	645134	🇺🇸 US 🇨🇦 CA	ABS Wheel Speed SensorFront	View on Amazon
HOLSTEIN Fits: all 2021 4500 engines	2HAR0035	🇺🇸 US 🇨🇦 CA	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — HOLSTEIN 2HAR0035 Includes ABS Wheel Speed Sensor Wire Harness Rear Left	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S824	🇺🇸 US 🇨🇦 CA	Connector Shape: SquareHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S824 Connector Shape: SquareHarness LengthIncludes ABS Wheel Speed Sensor Wire HarnessIncludes Wheel Speed Sensor Wiring Harnessinches: 7Length (In): 1.25Wiring Harness Length (mm): 209.55Black Rear Left	View on Amazon

This table covers the harness connectors at each ABS wheel-speed sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Accelerator Pedal Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S1478	🇺🇸 US 🇨🇦 CA	Connector Shape: Rectangle Fitment notes — STANDARD MOTOR PRODUCTS S1478 Connector Shape: Rectangle without Power Adjustable Pedals	View on Amazon

This table covers the harness connectors at the Accelerator Pedal Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Alternator / Generator Connector

Brand	Part Number	Markets	Notes	Buy
HOLSTEIN Fits: 6.4L V8	2HAR0035	🇺🇸 US 🇨🇦 CA	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — HOLSTEIN 2HAR0035 Includes ABS Wheel Speed Sensor Wire Harness Upper Unit	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2895	🇺🇸 US 🇨🇦 CA	Upper Unit	View on Amazon
WELLS Fits: all 2021 4500 engines	1P1877	🇺🇸 US 🇨🇦 CA	Wiring Harness Length: 18.75 In	View on Amazon

This table covers the harness connectors at the Alternator / Generator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Ambient Air Temperature Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S3250	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Ambient Air Temperature Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Battery Current Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S1686	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalBlack Fitment notes — STANDARD MOTOR PRODUCTS S1686 Connector Shape: OvalBlackIncludes Wheel Speed Sensor Wiring Harness, ABS Wheel Speed Sensor Wire Harness	View on Amazon

This table covers the harness connectors at the Battery Current Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Body Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 4500 engines	68399008AD	🇺🇸 US 🇨🇦 CA	Camera Fitment notes — MOPAR 68399008AD Camera Fits: Parkview Rear Back-Up CameraCrew Cab Wheelbase 4or Parkview Rear Back-up CameraCrew Cab197.4" Wheelbas or: Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 1or Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 2or Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 3or Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68403945AD	🇺🇸 US 🇨🇦 CA	Front Axle Disconnect Fitment notes — MOPAR 68403945AD Front Axle Disconnect Fits: Regular Cab Chassis Wheelbase 3or Regular Cab Chassis Wheelbase 4or Regular Cab Chassis Wheelbase 1or Regular Cab Chassis Wheelbase 2or Crew Cab Wheelbase 4or Crew Cab197.4" Wheelbase	View on Amazon
MOPAR Fits: all 2021 4500 engines	68412666AA	🇺🇸 US 🇨🇦 CA	Fits Trailer Tire Pressure Monitoring SystemCrew Cab Wheelbase 4or Trailer Tire Pressure Monitoring System Fitment notes — MOPAR 68412666AA Fits: Trailer Tire Pressure Monitoring SystemCrew Cab Wheelbase 4or Trailer Tire Pressure Monitoring SystemCrew Cab197.4" Wheelbas or: Trailer Tire Pressure Monitoring SystemRegular Cab Chassis Wheelbase 1or Trailer Tire Pressure Monitoring SystemRegular Cab Chassis Wheelbase 2or Trailer Tire Pressure Monitoring SystemRegular Cab Chassis Wheelbase 3or Trailer Tire Pressure Monitoring SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68457849AA	🇺🇸 US 🇨🇦 CA	Fits 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 3or 19 Speakers SRT High Perf Audio Fitment notes — MOPAR 68457849AA Fits: 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 3or 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 1or 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 2or 19 Speakers SRT High Perf AudioCrew Cab Wheelbase 4or 19 Speakers SRT High Perf AudioCrew Cab197.4" Wheelbas or: 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68457850AA	🇺🇸 US 🇨🇦 CA	Fits 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 3or 19 Speakers SRT High Perf Audio Fitment notes — MOPAR 68457850AA Fits: 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 3or 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 1or 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 2or 19 Speakers SRT High Perf AudioCrew Cab Wheelbase 4or 19 Speakers SRT High Perf AudioCrew Cab197.4" Wheelbas or: 19 Speakers SRT High Perf AudioRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68481372AA	🇺🇸 US 🇨🇦 CA	Mirror Fitment notes — MOPAR 68481372AA Mirror Fits: Rearview Autodim Digital Display MirrorExc. Full Speed FWD Collision Warn PlusRegular Cab Chassis Wheelbase 1or Rearview Autodim Digital Display MirrorExc. Full Speed FWD Collision Warn PlusRegular Cab Chassis Wheelbase 2or Rearview Autodim Digital Display MirrorExc. Full Speed FWD Collision Warn PlusRegular Cab Chassis Wheelbase 3or Rearview Autodim Digital Display MirrorExc. Full Speed FWD Collision Warn PlusRegular Cab Chassis Wheelbase 4	View on Amazon

This table covers the body-harness connectors and pigtails. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Camshaft Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2278	🇺🇸 US 🇨🇦 CA	BlackConnector Shape: Oval	View on Amazon
WALKER PRODUCTS Fits: 6.4L V8	2701145	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Camshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Controller Area Network (CAN) Bus Connector

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: all 2021 4500 engines	601309	🇺🇸 US 🇨🇦 CA	13-Way Green	View on Amazon
DORMAN Fits: all 2021 4500 engines	601308	🇺🇸 US 🇨🇦 CA	20-Way Green	View on Amazon

This table covers the harness connectors at the Controller Area Network (CAN) Bus. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Crankshaft Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
WALKER PRODUCTS Fits: 6.4L V8	2701145	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Crankshaft Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Diesel Exhaust Fluid (DEF) Pump Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68330360AB	🇺🇸 US 🇨🇦 CA	Urea Tank Harness Fitment notes — MOPAR 68330360AB Urea Tank Harness Fits: Cummins Engine.Selective Catalytic Reduction (UREA)Regular Cab Chassis Wheelbase 3or Cummins Engine.Selective Catalytic Reduction (UREA)Regular Cab Chassis Wheelbase 4or Cummins Engine.Selective Catalytic Reduction (Urea)Regular Cab Chassis Wheelbase 1or Cummins Engine.Selective Catalytic Reduction (Urea)Regular Cab Chassis Wheelbase 2or Cummins Engine.Selective Catalytic Reduction (Urea)Crew Cab Wheelbase 4or Cummins Engine.Selective Catalytic Reduction (Urea)Crew Cab197.4" Wheelbase	View on Amazon

This table covers the wiring-harness connectors at the Diesel Exhaust Fluid (DEF) Pump. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Differential Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S1410	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalWiring Harness Length (mm): 508	View on Amazon

This table covers the harness connectors at the Differential Pressure Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Door Lock Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2894	🇺🇸 US 🇨🇦 CA	Front and Rear Door	View on Amazon

This table covers the harness connectors at the Door Lock Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Door Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 4500 engines	68365982AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365982AD Rear Door Wiring Fits: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Crew Cab197.4" Wheelbas or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68365983AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365983AD Rear Door Wiring Fits: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Crew Cab197.4" Wheelbas or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68365984AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365984AD Rear Door Wiring Fits: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Crew Cab197.4" Wheelbas or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4	View on Amazon
MOPAR Fits: all 2021 4500 engines	68365985AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365985AD Rear Door Wiring Fits: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Crew Cab197.4" Wheelbas or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4	View on Amazon

This table covers the wiring-harness connectors at the Door. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

EGR Valve Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2498	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the EGR Valve. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Engine Block Heater Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.4L V8	68419912AB	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine.Engine Block Heater Fitment notes — MOPAR 68419912AB Fits: Heavy Duty HEMI MDS Engine.Engine Block HeaterCrew Cab Wheelbase 4or Heavy Duty HEMI MDS Engine.Engine Block HeaterCrew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68419913AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Engine Block Heater Fitment notes — MOPAR 68419913AB Fits: Cummins Engine.Engine Block HeaterCrew Cab Wheelbase 4or Cummins Engine.Engine Block HeaterCrew Cab197.4" Wheelbas or: Cummins Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 1or Cummins Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 2or Cummins Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 3or Cummins Engine.Engine Block HeaterRegular Cab Chassis Wheelbase 4	View on Amazon

This table covers the harness connectors at the Engine Block Heater. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Engine Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68533292AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.50 State Emissions, with Emergency Vehicle Emissions Fitment notes — MOPAR 68533292AB Fits: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissionswithout Emergency Vehicle EmissionsCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.50 State Emissionswithout Emergen	View on Amazon

This table covers the wiring-harness connectors at the Engine. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Exhaust Gas Temperature (EGT) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S3157	🇺🇸 US 🇨🇦 CA	Fits Located Before Particulate Filteror Located in Catalytic Converter	View on Amazon

This table covers the harness connectors at the Exhaust Gas Temperature (EGT) Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Injection Pressure Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S2902	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Fuel Injection Pressure Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Injector Connector

Brand	Part Number	Markets	Notes	Buy
SKP Fits: all 2021 4500 engines	SKS824	🇺🇸 US 🇨🇦 CA	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — SKP SKS824 Includes ABS Wheel Speed Sensor Wire Harness Rear Left	View on Amazon
WELLS Fits: 6.4L V8	1P2047	🇺🇸 US 🇨🇦 CA	Wiring Harness Length: 20.22 In	View on Amazon

This table covers the harness connectors at the Fuel Injector. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Fuel Sending Unit Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S1410	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalWiring Harness Length (mm): 508	View on Amazon

This table covers the harness connectors at the Fuel Sending Unit. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Headlamp Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.4L V8	52112316AE	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector Headlamps Fitment notes — MOPAR 52112316AE Fits: Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemCrew Cab Crew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemCrew Cab Wheelbase 4or Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.4L V8	68437635AB	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps Fitment notes — MOPAR 68437635AB Fits: Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Wheelbase 4or Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS EngineBI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.4L V8	68437637AB	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start System Fitment notes — MOPAR 68437637AB Fits: Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Wheelbase 4or Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS EngineBI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.4L V8	68437639AB	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start System Fitment notes — MOPAR 68437639AB Fits: Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Wheelbase 4or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab Chassis Wheelbas	View on Amazon
MOPAR Fits: 6.4L V8	68437640AB	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector Headlamps Fitment notes — MOPAR 68437640AB Fits: Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Wheelbase 4or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Heavy Duty HEMI MDS EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab Chas	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	52112319AE	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.BI-Function LED Projector Headlamps Fitment notes — MOPAR 52112319AE Fits: Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 4or Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Cummins Engine.BI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	52112323AE	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps Fitment notes — MOPAR 52112323AE Fits: Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 4or Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Cummins Engine.Halogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68517421AA	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera System Fitment notes — MOPAR 68517421AA Fits: Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 4or Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Cummins Engine.Halogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68517422AA	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera System Fitment notes — MOPAR 68517422AA Fits: Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Crew Cab197.4" Wheelbas or: Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 4or Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 1or Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 2or Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 3or Cummins Engine.BI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 4	View on Amazon

This table covers the wiring-harness connectors at the Headlamp. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Heater Core Temperature Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2478	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Heater Core Temperature Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Ignition Coil Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2087	🇺🇸 US 🇨🇦 CA	Gauge: 16-14 GA	View on Amazon
WELLS Fits: 6.4L V8	1P1801	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Ignition Coil. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Ignition Starter Switch Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68360695AD	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Regular Cab Chassis Wheelbase 3or Cummins Engine. Fitment notes — MOPAR 68360695AD Fits: Cummins Engine.Regular Cab Chassis Wheelbase 3or Cummins Engine.Regular Cab Chassis Wheelbase 4or Cummins Engine.Regular Cab Chassis Wheelbase 1or Cummins Engine.Regular Cab Chassis Wheelbase 2or Cummins Engine.Crew Cab Wheelbase 4or Cummins Engine.Crew Cab197.4" Wheelbase	View on Amazon

This table covers the harness connectors at the Ignition Starter Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Knock / Detonation Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2860	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalGauge: 16 Gauge Fitment notes — STANDARD MOTOR PRODUCTS S2860 Connector Shape: OvalGauge: 16 GaugeHarness LengthInches: 13Terminal Type: Bladeblack	View on Amazon

This table covers the harness connectors at the Knock / Detonation Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Parking Aid Sensor Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 4500 engines	68377331AD	🇺🇸 US 🇨🇦 CA	Fascia Wiring Fitment notes — MOPAR 68377331AD Fascia Wiring Fits: FrontBlack Front Bumper, Front Fog LampsExc. Parksense FR/RR Park Assist SystemCrew Cab Wheelbase 4 or: FrontBlack Front Bumper, Front Fog LampsExc. Parksense FR/RR Park Assist SystemRegular Cab Chassis Wheelbase 1 or: FrontBlack Front Bumper, Front Fog LampsExc. Parksense FR/RR Park Assist SystemRegular Cab Chassis Wheelbase 2 or: FrontBlack Front Bumper, Front Fog LampsExc. Parksense Front/Rear Park Assist SystemCrew Cab197.4" Wheelbase or: FrontBlack Front Bumper, Front Fog LampsExc. Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 3 or: FrontBlack Front Bumper, Front Fog LampsExc. Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 4 or: FrontBright Front Bumper, Front Fog LampsExc. LED Fog Lamps or Parksense Front/Rear Park Assist SystemCrew Cab197.4" Wheelbase or: FrontBright Front Bumper, Front Fog LampsExc. Front LED Fog Lamps or Parksense Front/Rear Park Assist SystemCrew Cab Wheelb	View on Amazon
MOPAR Fits: all 2021 4500 engines	68377334AD	🇺🇸 US 🇨🇦 CA	Fascia Wiring Fitment notes — MOPAR 68377334AD Fascia Wiring Fits: FrontBright Front Bumper, LED Fog Lamps, Parksense Front/Rear Park Assist SystemExc. Front Fog LampsCrew Cab197.4" Wheelbase or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemCrew Cab Wheelbase 4 or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemCrew Cab197.4" Wheelbase or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 1 or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 2 or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 3 or: FrontPainted Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 4 or: FrontBright Front Bumper, Front LED Fog Lamps, Parksense Front/Rear Park Assist SystemExc. Front Fog Lamps	View on Amazon
MOPAR Fits: all 2021 4500 engines	68377332AD	🇺🇸 US 🇨🇦 CA	Fascia Wiring Fitment notes — MOPAR 68377332AD Fascia Wiring Fits: FrontBlack Front Bumper, Front Fog Lamps, Parksense FR/RR Park Assist SystemCrew Cab Wheelbase 4 or: FrontBlack Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemCrew Cab197.4" Wheelbase or: FrontBlack Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 1 or: FrontBlack Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 2 or: FrontBlack Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 3 or: FrontBlack Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 4 or: FrontBright Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemExc. Front LED Fog LampsCrew Cab197.4" Wheelbase or: FrontBright Front Bumper, Front Fog Lamps, Parksense Front/Rear Park Assist SystemExc. LED Fog LampsRegular Cab Chassis Wheelbase 1 or: Front	View on Amazon
MOPAR Fits: all 2021 4500 engines	68377333AD	🇺🇸 US 🇨🇦 CA	Fascia Wiring Fitment notes — MOPAR 68377333AD Fascia Wiring Fits: FrontBright Front Bumper, LED Fog LampsExc. Front Fog Lamps or Parksense Front/Rear Park Assist SystemCrew Cab197.4" Wheelbase or: FrontBright Front Bumper, Front LED Fog LampsExc. Front Fog Lamps or Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 3 or: FrontBright Front Bumper, Front LED Fog LampsExc. Front Fog Lamps or Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 4 or: FrontBright Front BumperExc. Parksense Front/Rear Park Assist SystemCrew Cab Wheelbase 4 or: FrontBright Front BumperExc. Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 1 or: FrontBright Front BumperExc. Parksense Front/Rear Park Assist SystemRegular Cab Chassis Wheelbase 2	View on Amazon

This table covers the harness connectors at the Parking Aid Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Radiator Fan Motor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2267	🇺🇸 US 🇨🇦 CA	Connector Shape: Round	View on Amazon

This table covers the harness connectors at the Radiator Fan Motor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Starter Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2984	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Starter Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Steering Wheel Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 4500 engines	68449242AA	🇺🇸 US 🇨🇦 CA	Fits Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezels-aluminum Litho W Real Wood# 2, Steering Wheel Mounted Audio Controls, Heated Steering WheelCrew Cab Wheelbase 4or Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezels-aluminum Litho W Real Wood# 2, Steering Wheel Mounted Audio Controls, Heated Steering Wheel Fitment notes — MOPAR 68449242AA Fits: Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezels-aluminum Litho W Real Wood# 2, Steering Wheel Mounted Audio Controls, Heated Steering WheelCrew Cab Wheelbase 4or Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezels-aluminum Litho W Real Wood# 2, Steering Wheel Mounted Audio Controls, Heated Steering WheelCrew Cab197.4" Wheelbas or: Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezels-aluminum Litho W Real Wood# 2, Steering Wheel Mounted Audio Controls, Heated Steering WheelRegular Cab Chassis Wheelbase 1or Wood/Leather Wrapped Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Adaptive Cruise Control with Stop, Instrument Panel Bezel	View on Amazon
MOPAR Fits: all 2021 4500 engines	68449246AA	🇺🇸 US 🇨🇦 CA	Fits 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Speed Control, Instrument Panel Bezels-Painted with HydrographicsExc. Steering Wheel Mounted Audio Controls Fitment notes — MOPAR 68449246AA Fits: 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Speed Control, Instrument Panel Bezels-Painted with HydrographicsExc. Steering Wheel Mounted Audio ControlsCrew Cab Wheelbase 4or 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Speed Control, Instrument Panel Bezels-Painted with HydrographicsExc. Steering Wheel Mounted Audio ControlsCrew Cab197.4" Wheelbas or: 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Speed Control, Instrument Panel Bezels-Painted with HydrographicsExc. Steering Wheel Mounted Audio ControlsRegular Cab Chassis Wheelbase 1or 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select, Speed Control, Instrument Panel Bezels-Painted with HydrographicsExc. Steering Wheel Mounted Audio ControlsRegular Cab Chassis Wheelbase 2or 4-Spoke Steering Wheel, Integrated Voice Command with Bluetooth, Electronic Range Select,	View on Amazon

This table covers the harness connectors at the Steering Wheel. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Steering Wheel Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2468	🇺🇸 US 🇨🇦 CA	Angle Sensor	View on Amazon

This table covers the harness connectors at the Steering Wheel Position Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Temperature Sender / Sensor Connector

Brand	Part Number	Markets	Notes	Buy
WALKER PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	2111500	🇺🇸 US 🇨🇦 CA	Terminal Quantity: 2Includes O-Ring	View on Amazon
WELLS Fits: 6.4L V8	1P2227	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Temperature Sender / Sensor. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Throttle Control Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2409	🇺🇸 US 🇨🇦 CA	Gender: MaleHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S2409 Gender: MaleHarness Lengthinches: 12.5	View on Amazon

This table covers the harness connectors at the Throttle Control Actuator. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Adapter Connector

Brand	Part Number	Markets	Notes	Buy
CURT Fits: all 2021 4500 engines	57101	🇺🇸 US 🇨🇦 CA	7-Way Round RV To 4-Way Flat Adapter Fitment notes — CURT 57101 7-Way Round RV To 4-Way Flat Adapter Tradesmanwith Back Up AlarmGM/Ford Plugwith Factory Tow Package	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	56019823	🇺🇸 US 🇨🇦 CA	Trailer Tow Wiring Adapter converts seven-Way round connector To four-Way flat connector	View on Amazon

This table covers the harness connectors at the Trailer Adapter. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Brake Switch Connector

Brand	Part Number	Markets	Notes	Buy
CURT Fits: all 2021 4500 engines	51457	🇺🇸 US 🇨🇦 CA	Brake Control Adapter Harness Fitment notes — CURT 51457 Brake Control Adapter Harness Tradesmanwith Quick PlugExcept OEM Integrated Trailer Brake Control	View on Amazon
CURT Fits: all 2021 4500 engines	51458	🇺🇸 US 🇨🇦 CA	Brake Control Adapter Harness Fitment notes — CURT 51458 Brake Control Adapter Harness Tradesmanwith Quick Plug	View on Amazon

This table covers the harness connectors at the Trailer Brake Switch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Connector

Brand	Part Number	Markets	Notes	Buy
CURT Popular Fits: all 2021 4500 engines	55415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM Socket Fitment notes — CURT 55415 Replacement 7-Way RV Blade OEM Socket Tradesmanwith Factory Tow Package	View on Amazon
CURT Popular Fits: all 2021 4500 engines	56229	🇺🇸 US 🇨🇦 CA	7-Way USCAR Electrical ConnectorLength: 24 in. Fitment notes — CURT 56229 7-Way USCAR Electrical ConnectorLength: 24 in.Bonded Wire Tradesmanwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	56415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM SocketTwist-In Fitment notes — CURT 56415 Replacement 7-Way RV Blade OEM SocketTwist-In Tradesmanwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	55515	🇺🇸 US 🇨🇦 CA	Custom Wiring ConnectorOE 4-Way Flat Fitment notes — CURT 55515 Custom Wiring ConnectorOE 4-Way FlatPlugs Into USCAR TradesmanReplacement2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	56515	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector5-Way Flat Fitment notes — CURT 56515 Custom Wiring Connector5-Way Flat Tradesman2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	55774	🇺🇸 US 🇨🇦 CA	OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way Fitment notes — CURT 55774 OEM Vehicle to Trailer Connector with Harness7-Way and 4-Way Tradesmanwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	57015	🇺🇸 US 🇨🇦 CA	OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket Fitment notes — CURT 57015 OEM Replacement Dual-Output 7 and 4 Way ConnectorPlugs Into USCAR Socket Tradesman	View on Amazon
CURT Fits: all 2021 4500 engines	55384	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector4-Way Flat Fitment notes — CURT 55384 Custom Wiring Connector4-Way FlatRetains Use of 7 Way Round Connector Tradesman2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 4500 engines	57020	🇺🇸 US 🇨🇦 CA	OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged Fitment notes — CURT 57020 OEM Replacement Dual-Output 7 and 4 Way ConnectorPackaged TradesmanFactory TowPlugs Into USCAR	View on Amazon
CURT Fits: all 2021 4500 engines	56584	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness5-Way Flat Fitment notes — CURT 56584 Custom Wiring Harness5-Way FlatRetains Use Of 7-Way OEM Tradesman2-Wire Systemwith Factory Tow Package	View on Amazon

This table covers the trailer-lighting connectors at the hitch. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Trailer Extension Connector

Brand	Part Number	Markets	Notes	Buy
CURT Fits: all 2021 4500 engines	56475	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness Extension Fitment notes — CURT 56475 Custom Wiring Harness Extension Tradesman20"Uscar To Uscarwith Factory Tow Package	View on Amazon

This table covers the harness connectors at the Trailer Extension. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Transmission-Automatic Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 4500 engines	68224246AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS EnginePower Take Off Prep - Left Side Fitment notes — MOPAR 68224246AA Fits: Heavy Duty HEMI MDS EnginePower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EnginePower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EnginePower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EnginePower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EngineExc. Power Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EnginePower Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EngineExcept Power Take Off Preparation - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS EngineExcept Power Take Off Preparation - Left SideRegula Fits: Cummins Engine.Except Power Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Except Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Except Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Except Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Except Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Exc. Power Take Off Prep - Left SideCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Power Take Off Preparation - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Power Take Off Preparation - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins	View on Amazon
MOPAR Fits: 6.4L V8	68517655AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine180 Amp Alternator Fitment notes — MOPAR 68517655AA Fits: Heavy Duty HEMI MDS Engine180 Amp AlternatorExc. Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amps AlternatorExc. Adaptive Steering SystemCrew Cab Crew Cab197.4" Wheelbase6 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amps AlternatorExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amps AlternatorExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amps AlternatorExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amps AlternatorExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS66RC HD Trans	View on Amazon
MOPAR Fits: 6.4L V8	68517656AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68517656AA Fits: Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Manual Shift-On-The-Fly Tra	View on Amazon
MOPAR Fits: 6.4L V8	68517657AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68517657AA Fits: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine180 Amp Alternator, Electric Shif	View on Amazon
MOPAR Fits: 6.4L V8	68517658AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine220 Amp Alternator Fitment notes — MOPAR 68517658AA Fits: Heavy Duty HEMI MDS Engine220 Amp AlternatorExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amps AlternatorExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemCrew Cab Crew Cab197.4" Wheelbase6 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amps AlternatorExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amps AlternatorExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amps AlternatorExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amps AlternatorExc. Dual Alte	View on Amazon
MOPAR Fits: 6.4L V8	68517659AA	🇺🇸 US 🇨🇦 CA	Fits Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68517659AA Fits: Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemCrew Cab Crew Cab197.4" Wheelbase6 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Dual Alternators Rated At 380 Amps or Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD Trans or: Heavy Duty HEMI MDS Engine220 Amp Alternator, MAN Shift-On-The-Fly Transfer CaseExc. Dual Alternators Rate	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484736AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Electric Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68484736AB Fits: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Electric Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484737AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Manual Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68484737AB Fits: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer CaseExc. Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484738AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Exc. Adaptive Steering System Fitment notes — MOPAR 68484738AB Fits: Cummins Engine.Exc. Adaptive Steering SystemExcept Manual Shift-On-The-Fly Transfer CaseExc. Elec Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Exc. Adaptive Steering SystemExcept Manual Shift-On-The-Fly Transfer CaseExc. Elec Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Exc. Adaptive Steering SystemExcept Manual Shift-On-The-Fly Transfer CaseExc. Elec Shift-On-The-Fly Transfer CaseRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Exc. Adaptive Steering SystemExcept Manual Shift-On-The-Fly Transfer CaseExc. Elec Shift-On-The-Fly Transfer CaseRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Exc. Adaptive Steering SystemExcept Manual Shift-On-The-Fly Transfer CaseExc. Elec Shift-On-The-Fly Transfer CaseRegular Cab Chassis Wheelbase 36 Speed A	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484739AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering System Fitment notes — MOPAR 68484739AB Fits: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Elec Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484740AB	🇺🇸 US 🇨🇦 CA	Fits Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering System Fitment notes — MOPAR 68484740AB Fits: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemCrew Cab197.4" Wheelbase6 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 36 Speed Auto Aisin AS69RC HD Trans or: Cummins Engine.Manual Shift-On-The-Fly Transfer Case, Adaptive Steering SystemRegular Cab Chassis Wheelbase 46 Speed Auto Aisin AS69RC HD Trans	View on Amazon

This table covers the wiring-harness connectors at the Transmission-Automatic. Typical signs include an intermittent fault that moves when you wiggle the harness, or a melted or corroded plug. Match terminal count and keyway. Repair with heat-shrink terminals, not twist-and-tape.

Vapor Canister Purge Valve / Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	HP4325	🇺🇸 US 🇨🇦 CA	HandypackConnector Shape: Rectangle Fitment notes — STANDARD MOTOR PRODUCTS HP4325 HandypackConnector Shape: RectangleHarness Length16-1/2 "Terminal Type: Blade	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S1024	🇺🇸 US 🇨🇦 CA	Connector Shape: RectangleHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S1024 Connector Shape: RectangleHarness Length16-1/2 "Terminal Type: Blade	View on Amazon

This table covers the harness connectors at the Vapor Canister Purge Valve / Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Vapor Leak Detection Pump Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	HP4325	🇺🇸 US 🇨🇦 CA	HandypackConnector Shape: Rectangle Fitment notes — STANDARD MOTOR PRODUCTS HP4325 HandypackConnector Shape: RectangleHarness Length16-1/2 "Terminal Type: Blade	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S1024	🇺🇸 US 🇨🇦 CA	Connector Shape: RectangleHarness Length Fitment notes — STANDARD MOTOR PRODUCTS S1024 Connector Shape: RectangleHarness Length16-1/2 "Terminal Type: Blade	View on Amazon

This table covers the harness connectors at the Vapor Leak Detection Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Variable Power Steering Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S3145	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Variable Power Steering Solenoid. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Washer Pump Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 4500 engines	S2279	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Washer Pump. Typical signs include an intermittent fault that moves when you wiggle the plug, green corrosion, or a melted housing. Match terminal count and keyway, not just color. Many families look identical and will not lock.

Buying Electrical Connector Parts for a 2021 Ram 4500

On this vehicle, the connector system supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules.

Match the engine first. Some electrical connector parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
Read the notes on each row for position, trim and spec qualifiers before you order.
Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.
Cross-reference the manufacturer part number against your old part or a service-manual listing.

Start with the largest groups on this page: Transmission-Automatic Wiring Harness / Connector and Trailer Connector .

Frequently Asked Questions

How many electrical connector parts fit the 2021 Ram 4500?

Our catalog currently lists 97 electrical connector parts for the 2021 Ram 4500 across 42 subcategories and 9 brands, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.

Do electrical connector parts differ between 2021 Ram 4500 engines?

Some do. 52 parts fit every engine; the other 45 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.

What are the signs of electrical connector problems on a 2021 Ram 4500?

Common symptoms include intermittent faults that move when the harness is wiggled, green corrosion inside a plug, or melted connector housings near heat sources. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.

What should I replace at the same time?

Where labor overlaps, use heat-shrink crimp connectors rather than twist-and-tape for any pigtail splice, especially outside the cabin.

What do the market flags (US, CA, MX) on each part mean?

They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Ram 4500 was originally sold in the US, the safest choice is a part marked for the US market.

How do I make sure a part fits my 2021 Ram 4500?

First match the engine — each row shows which engine(s) the part fits. Then match the connector by terminal count and keyway, not just appearance — many families look identical but will not lock. The notes column carries position and trim qualifiers where they apply.

Other Parts for the 2021 Ram 4500

Belt Drive Body & Lamp Assembly Brake & Wheel Hub Cooling System Drivetrain Electrical Electrical Bulb & Socket Electrical Switch & Relay Engine Exhaust & Emission Fuel & Air Heat & Air Conditioning Ignition Interior Steering Suspension Automatic Transmission Wheel Wiper & Washer

Electrical Connector Parts for Other Ram 4500 Years

2026 Ram 4500 2025 Ram 4500 2024 Ram 4500 2023 Ram 4500 2022 Ram 4500 2020 Ram 4500 2019 Ram 4500 2018 Ram 4500 2017 Ram 4500 2016 Ram 4500 2015 Ram 4500 2014 Ram 4500

Switch vehicle or jump to a subcategory

Make Year Model Engine Part category Subcategory

Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.

Published by AutoFactsDB from manufacturer application data. How fitment is matched Report a fitment error