2021 Ram 3500 Electrical Connector Parts: OEM & Replacement (123 Parts)

Q: How many electrical connector parts fit the 2021 Ram 3500?

Our catalog currently lists 123 electrical connector parts for the 2021 Ram 3500 across 49 subcategories and 10 brands, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.

Q: Do electrical connector parts differ between 2021 Ram 3500 engines?

Some do. 63 parts fit every engine; the other 60 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.

Q: What are the signs of electrical connector problems on a 2021 Ram 3500?

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.

Q: 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.

Q: 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 3500 was originally sold in the US, the safest choice is a part marked for the US market.

Q: How do I make sure a part fits my 2021 Ram 3500?

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.

The 2021 Ram 3500 has 123 electrical connector parts with verified fitment on this page — 49 part types and 10 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 3500 supplies the pigtails and connector bodies that terminate the vehicle harness at lamps, sensors and modules. The largest groups are Trailer Connector (15 parts), Transmission-Automatic Wiring Harness / Connector (11 parts) and Headlamp Wiring Harness / Connector (9 parts). The other 46 part types cover the remaining 88 parts.

A/C Compressor Clutch Coil Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 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.

A/C Refrigerant Pressure Switch Connector

Brand	Part Number	Markets	Notes	Buy
HOLSTEIN Fits: all 2021 3500 engines	2HAR0060	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	S2316	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalNumber of Splice Connectors Included: 3	View on Amazon

This table covers the harness connectors at the A/C Refrigerant Pressure 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.

ABS Wheel Speed Sensor Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: all 2021 3500 engines	PT2160	🇺🇸 US 🇨🇦 CA	GoldShape: Square Fitment notes — ACDELCO PT2160 GoldShape: Square Fits: Rear Leftwithout Dual Rear Wheels (DRW) or: Rear Leftwithout dual Rear Left wheels (drw)	View on Amazon
HOLSTEIN Fits: all 2021 3500 engines	2HAR0035	🇺🇸 US 🇨🇦 CA	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — HOLSTEIN 2HAR0035 Includes ABS Wheel Speed Sensor Wire Harness Rear Leftwith Single Rear Wheels (SRW)	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 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 Fits: Rear Leftwithout Dual Rear Wheels (DRW) or: RearLeftwithout Dual Rear Wheels (DRW)	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 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 Fits: Rear Leftwithout Dual Rear Wheels (DRW) or: RearLeftwithout Dual Rear Wheels (DRW)	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 3500 engines	S1478	🇺🇸 US 🇨🇦 CA	Connector Shape: Rectangle	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 3500 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.

Battery Current Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 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 3500 engines	68387005AC	🇺🇸 US 🇨🇦 CA	Fits Box or Rambox Cargo Management System, Locking TailgateRegular Cab Fitment notes — MOPAR 68387005AC Fits: Box or Rambox Cargo Management System, Locking TailgateRegular Cab8 Foot BedHD 4WD or: Box or Rambox Cargo Management System, Locking TailgateMega CabHD 4WD or: Box or Rambox Cargo Management System, Locking TailgateCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Locking TailgateCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Popular Fits: all 2021 3500 engines	68399008AD	🇺🇸 US 🇨🇦 CA	Camera Fitment notes — MOPAR 68399008AD Camera Fits: Cab ChassisParkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 2HD 4WD or: Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Parkview Rear Back-Up CameraRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Delete Box, Parkview Rear Back-up CameraCrew Cab8' BoxHD 4WD or: Delete BoxParkview Rear Back-up CameraMega CabHD 4WD or: Delete BoxParkview Rear Back-up CameraRegular Cab8 Foot BedHD 4WD or: Parkview Rear Back-Up CameraCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Parkview Rear Back-Up CameraCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Delete Box, Parkview Rear Back-up CameraCrew Cab Wheelbase 2HD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	52112344AD	🇺🇸 US 🇨🇦 CA	Frame to DashFront Axle Disconnect Fitment notes — MOPAR 52112344AD Frame to DashFront Axle Disconnect Fits: FrontUp To 08/19/2021Mega CabHD 4WD or: FrontUp To 08/19/2021Regular Cab8 Foot BedHD 4WD or: FrontUp To 08/19/2021Crew Cab Crew Cab8' BoxHD 4WD or: FrontCab ChassisUp To 08/19/2021Regular Cab Chassis Wheelbase 2HD 4WD or: FrontUp To 08/19/2021Crew Cab Wheelbase 2HD 4WD or: FrontUp To 08/19/2021Crew Cab Wheelbase 4HD 4WD<10K Lb. Cab Chassis or: FrontUp To 08/19/2021Regular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	52112345AC	🇺🇸 US 🇨🇦 CA	Frame To Dash Fitment notes — MOPAR 52112345AC Frame To Dash Fits: Regular Cab8 Foot Bedor Crew Cab8' Boxor Cab ChassisRegular Cab Chassis Wheelbase 2or Regular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Crew Cab Wheelbase 2or Crew Cab Wheelbase 4<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	52112345AD	🇺🇸 US 🇨🇦 CA	Frame to DashFront Axle Disconnect Fitment notes — MOPAR 52112345AD Frame to DashFront Axle Disconnect Fits: FrontRegular Cab8 Foot Bed or: FrontCrew Cab8' Box or: FrontCab ChassisRegular Cab Chassis Wheelbase 2 or: FrontRegular Cab Chassis Wheelbase 1<10K Lb. Cab Chassis or: FrontCrew Cab Wheelbase 2 or: FrontCrew Cab Wheelbase 4<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	68396011AB	🇺🇸 US 🇨🇦 CA	Tail Lamp Fitment notes — MOPAR 68396011AB Tail Lamp Fits: Box or Rambox Cargo Management System, Incandescent TaillampsExcept European TaillampsCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Incandescent TaillampsExcept European TaillampsCrew Cab Crew Cab8' BoxHD 4WD or: Box or Rambox Cargo Management System, Incandescent TaillampsExcept European TaillampsMega CabHD 4WD or: Box or Rambox Cargo Management System, Incandescent TaillampsExcept European TaillampsRegular Cab8 Foot BedHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68396013AB	🇺🇸 US 🇨🇦 CA	Tail Lamp Fitment notes — MOPAR 68396013AB Tail Lamp Fits: Box or Rambox Cargo Management System, Blind Spot and Cross Path DetectionExcept European TaillampsCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Blind Spot and Cross Path DetectionExcept European TaillampsCrew Cab Crew Cab8' BoxHD 4WD or: Box or Rambox Cargo Management System, Blind Spot and Cross Path DetectionExcept European TaillampsMega CabHD 4WD or: Box or Rambox Cargo Management System, Blind Spot and Cross Path DetectionExcept European TaillampsRegular Cab8 Foot BedHD 4WD	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 3500 engines	601309	🇺🇸 US 🇨🇦 CA	13-Way Green	View on Amazon
DORMAN Fits: all 2021 3500 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
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2916	🇺🇸 US 🇨🇦 CA		View on Amazon
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.

Cylinder Deactivation Solenoid Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2442	🇺🇸 US 🇨🇦 CA	with Only Connector	View on Amazon
WELLS Fits: 6.4L V8	1P2227	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Cylinder Deactivation 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.

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: Cab ChassisCummins EngineSelective Catalytic Reduction (Urea)Regular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineSelective Catalytic Reduction (Urea)Regular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisCummins engineSelective Catalytic Reduction (Urea)Crew Cab Wheelbase 4HD 4WD	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 3500 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 3500 engines	68365982AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365982AD Rear Door Wiring Fits: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 2HD 4WD or: Speed Sensitive Power Locks, Rear Door Accent LightingMega CabHD 4WD or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68365983AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365983AD Rear Door Wiring Fits: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 2HD 4WD or: Speed Sensitive Power Locks, Rear Door Accent LightingMega CabHD 4WD or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Speed Sensitive Power Locks, Rear Door Accent LightingCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68365984AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365984AD Rear Door Wiring Fits: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 2HD 4WD or: Speed Sensitive Power LocksExc. Rear Door Accent LightingMega CabHD 4WD or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68365985AD	🇺🇸 US 🇨🇦 CA	Rear Door Wiring Fitment notes — MOPAR 68365985AD Rear Door Wiring Fits: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 2HD 4WD or: Speed Sensitive Power LocksExc. Rear Door Accent LightingMega CabHD 4WD or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Speed Sensitive Power LocksExc. Rear Door Accent LightingCrew Cab Crew Cab8' BoxHD 4WD	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 3500 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	68409911AB	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisEngine Block Heater Fitment notes — MOPAR 68409911AB Fits: Cab ChassisEngine Block HeaterRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisEngine Block HeaterRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisEngine Block HeaterCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD TransHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68409910AB	🇺🇸 US 🇨🇦 CA	Fits Cummins EngineCummins engine HO Engine Fitment notes — MOPAR 68409910AB Fits: Cummins EngineCummins engine HO EngineEngine Block HeaterCrew Cab Crew Cab8' Boxor Cummins EngineCummins engine HO EngineEngine Block HeaterRegular Cab8 Foot Bedor Cummins EngineCummins engine HO EngineEngine Block HeaterCrew Cab Wheelbase 2HD 4WD or: Cummins engine HO EngineEngine Block HeaterMega CabHD 4WD or: Cummins engine HO EngineEngine Block HeaterRegular Cab8 Foot BedHD 4WD or: Cab ChassisCummins EngineEngine Block HeaterCrew Cab Wheelbase 4HD 4WD or: Cab ChassisCummins EngineEngine Block HeaterRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineEngine Block HeaterRegular Cab Chassis Wheelbase 2HD 4WD or: Cummins engine HO EngineEngine Block HeaterCrew Cab8' BoxHD 4WD	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 Cab ChassisCummins Engine Fitment notes — MOPAR 68533292AB Fits: Cab ChassisCummins Engine50 State Emissionswithout Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisCummins Engine50 State Emissionswithout Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisCummins Engine50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisCummins Engine50 State Emissions, with Emergency Vehicle EmissionsRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisCummins Engine50 State Emissions, with Emergency Vehicle EmissionsCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisCummins Engine50 State Emissionswithout Emergency Vehicle EmissionsCrew Cab Wheelbase 46 Speed Auto Aisin AS69RC HD TransHD 4WD	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	S3159	🇺🇸 US 🇨🇦 CA	Located on EGR Crossover Tube	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S3157	🇺🇸 US 🇨🇦 CA	Located Before Particulate Filter	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 3500 engines	SKS824	🇺🇸 US 🇨🇦 CA	Includes ABS Wheel Speed Sensor Wire Harness Fitment notes — SKP SKS824 Includes ABS Wheel Speed Sensor Wire Harness without Dual Rear Wheels (DRW)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: all 2021 3500 engines	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.

Grille Air Intake / Shutter Actuator Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S2511	🇺🇸 US 🇨🇦 CA	Connector Shape: Oval	View on Amazon

This table covers the harness connectors at the Grille Air Intake / Shutter 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.

Headlamp Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: 6.4L V8	52112314AE	🇺🇸 US 🇨🇦 CA	Fits BI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera System Fitment notes — MOPAR 52112314AE Fits: BI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemMega CabHD 4WD or: BI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: BI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: BI-Function LED Projector HeadlampsExc. Remote Start System or Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	52112316AE	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisSurround View Camera System, BI-Function LED Projector Headlamps Fitment notes — MOPAR 52112316AE Fits: Cab ChassisSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisHeavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemCrew Cab Wheelbase 4<10,000 LB GVW or: Cab ChassisHeavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemCrew Cab Wheelbase 4HD 4WD<10,000 LB GVW or: Cab ChassisHeavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 1<10,000 LB GVW or: Cab ChassisHeavy Duty HEMI MDS EngineSurround View Camera System, BI-Function LED Projector HeadlampsExc. Remote Start SystemRegular Cab Chassis Wheelbase 1HD 4WD<10,000 LB GVW	View on Amazon
MOPAR Fits: 6.4L V8	52112318AE	🇺🇸 US 🇨🇦 CA	Fits BI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera System Fitment notes — MOPAR 52112318AE Fits: BI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemMega CabHD 4WD or: BI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: BI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: BI-Function LED Projector Headlamps, Remote Start SystemExc. Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	52112322AE	🇺🇸 US 🇨🇦 CA	Fits Halogen Quad Headlamps or LED Reflector Headlamps, Remote Start System, Active Noise Control SystemExc. Surround View Camera System Fitment notes — MOPAR 52112322AE Fits: Halogen Quad Headlamps or LED Reflector Headlamps, Remote Start System, Active Noise Control SystemExc. Surround View Camera SystemMega CabHD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Remote Start System, Active Noise Control SystemExc. Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Remote Start System, Active Noise Control SystemExc. Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Remote Start System, Active Noise Control SystemExc. Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	52112324AE	🇺🇸 US 🇨🇦 CA	Fits Halogen Quad Headlamps or LED Reflector Headlamps, Active Noise Control SystemExc. Remote Start System or Surround View Camera System Fitment notes — MOPAR 52112324AE Fits: Halogen Quad Headlamps or LED Reflector Headlamps, Active Noise Control SystemExc. Remote Start System or Surround View Camera SystemMega CabHD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Active Noise Control SystemExc. Remote Start System or Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Active Noise Control SystemExc. Remote Start System or Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Halogen Quad Headlamps or LED Reflector Headlamps, Active Noise Control SystemExc. Remote Start System or Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	52112319AE	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisCummins Engine Fitment notes — MOPAR 52112319AE Fits: Cab ChassisCummins EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisCummins EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 4HD 4WD or: Cummins engine HO EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemCrew Cab8' BoxHD 4WD or: Cummins EngineCummins engine HO EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Cummins engine HO EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Cummins engine HO EngineBI-Function LED Projector HeadlampsExc. Surround View Camera SystemMega CabHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	52112323AE	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisCummins Engine Fitment notes — MOPAR 52112323AE Fits: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 4HD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector HeadlampsExc. Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Cummins EngineHalogen Quad Headlamps or LED Reflector	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68517421AA	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisCummins Engine Fitment notes — MOPAR 68517421AA Fits: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisCummins EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 4HD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Cummins EngineCummins engine HO EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 2or Cummins engine HO EngineHalogen Quad Headlamps or LED Reflector Headlamps, Surround View Cam	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68517422AA	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisCummins Engine Fitment notes — MOPAR 68517422AA Fits: Cab ChassisCummins EngineBI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisCummins EngineBI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisCummins EngineBI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 4HD 4WD or: Cummins EngineCummins engine HO EngineBI-Function LED Projector Headlamps, Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Cummins EngineCummins engine HO EngineBI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 2or Cummins EngineCummins engine HO EngineBI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Crew Cab8' Boxor Cummins engine HO EngineBI-Function LED Projector Headlamps, Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Cummins engine HO EngineBI-Function LED Projector Headlamps,	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 3500 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.

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.

License Plate Lamp Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	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 License Plate Lamp. 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.

Manifold Pressure (MAP) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2916	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Manifold Pressure (MAP) 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.

Mass Air Flow (MAF) Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S2894	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the harness connectors at the Mass Air Flow (MAF) 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.

Oil Pressure Sender / Switch Connector

Brand	Part Number	Markets	Notes	Buy
HOLSTEIN Fits: 6.4L V8	2HAR0060	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2316	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalNumber of Splice Connectors Included: 3	View on Amazon

This table covers the harness connectors at the Oil Pressure Sender / 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.

Parking / Turn Signal Lamp Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	S2983	🇺🇸 US 🇨🇦 CA	Black Fitment notes — STANDARD MOTOR PRODUCTS S2983 Black Front	View on Amazon

This table covers the harness connectors at the Parking / Turn Signal Lamp. 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
HOLSTEIN Fits: all 2021 3500 engines	2HAR0060	🇺🇸 US 🇨🇦 CA	Rear	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	S2316	🇺🇸 US 🇨🇦 CA	Connector Shape: OvalNumber of Splice Connectors Included: 3 Fitment notes — STANDARD MOTOR PRODUCTS S2316 Connector Shape: OvalNumber of Splice Connectors Included: 3 Fits: Rear or: Front	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 Position Sensor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 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.

Tailgate Wiring Harness / Connector

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	68509787AA	🇺🇸 US 🇨🇦 CA	Tailgate Wiring Fitment notes — MOPAR 68509787AA Tailgate Wiring Fits: Box or Rambox Cargo Management System, Dual Rear WheelsExc. Surround View Camera SystemMega CabHD 4WD or: Box or Rambox Cargo Management System, Dual Rear WheelsExc. Surround View Camera SystemRegular Cab8 Foot BedHD 4WD or: Box or Rambox Cargo Management System, Dual Rear WheelsExc. Surround View Camera SystemCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Dual Rear WheelsExc. Surround View Camera SystemCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68509788AA	🇺🇸 US 🇨🇦 CA	Tailgate Wiring Fitment notes — MOPAR 68509788AA Tailgate Wiring Fits: Box or Rambox Cargo Management SystemExc. Surround View Camera System or Dual Rear WheelsMega CabHD 4WD or: Box or Rambox Cargo Management SystemExc. Surround View Camera System or Dual Rear WheelsRegular Cab8 Foot BedHD 4WD or: Box or Rambox Cargo Management SystemExc. Surround View Camera System or Dual Rear WheelsCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management SystemExc. Surround View Camera System or Dual Rear WheelsCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68509789AA	🇺🇸 US 🇨🇦 CA	Tailgate Wiring Fitment notes — MOPAR 68509789AA Tailgate Wiring Fits: Box or Rambox Cargo Management System, Surround View Camera System, Dual Rear WheelsMega CabHD 4WD or: Box or Rambox Cargo Management System, Surround View Camera System, Dual Rear WheelsRegular Cab8 Foot BedHD 4WD or: Box or Rambox Cargo Management System, Surround View Camera System, Dual Rear WheelsCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Surround View Camera System, Dual Rear WheelsCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68509790AA	🇺🇸 US 🇨🇦 CA	Tailgate Wiring Fitment notes — MOPAR 68509790AA Tailgate Wiring Fits: Box or Rambox Cargo Management System, Surround View Camera SystemExc. Dual Rear WheelsMega CabHD 4WD or: Box or Rambox Cargo Management System, Surround View Camera SystemExc. Dual Rear WheelsRegular Cab8 Foot BedHD 4WD or: Box or Rambox Cargo Management System, Surround View Camera SystemExc. Dual Rear WheelsCrew Cab Wheelbase 2HD 4WD or: Box or Rambox Cargo Management System, Surround View Camera SystemExc. Dual Rear WheelsCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon

This table covers the wiring-harness connectors at the Tailgate. 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.

Temperature Sender / Sensor Connector

Brand	Part Number	Markets	Notes	Buy
ACDELCO Fits: 6.7L L6 DIESEL Turbocharged	PT2386	🇺🇸 US 🇨🇦 CA	GoldShape: Square	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.4L V8	S2442	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	HP3840	🇺🇸 US 🇨🇦 CA	HandypackWiring Harness Length (mm): 158.75 Fitment notes — STANDARD MOTOR PRODUCTS HP3840 HandypackWiring Harness Length (mm): 158.75black	View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	TX3A	🇺🇸 US 🇨🇦 CA	Wiring Harness Length (mm): 158.75Black	View on Amazon
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
BWD/NIEHOFF Fits: 6.7L L6 DIESEL Turbocharged	PT1267	🇺🇸 US 🇨🇦 CA	Throttle Actuator ConnectorElectric Throttle Body Actuator Connector	View on Amazon
HOLSTEIN Fits: 6.7L L6 DIESEL Turbocharged	2HAR0013	🇺🇸 US 🇨🇦 CA		View on Amazon
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
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	S1768	🇺🇸 US 🇨🇦 CA		View on Amazon
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	HP4105	🇺🇸 US 🇨🇦 CA	Handypack	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 3500 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 Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Back Up AlarmGM/Ford Plugwith Factory Tow Package	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 3500 engines	51457	🇺🇸 US 🇨🇦 CA	Brake Control Adapter Harness Fitment notes — CURT 51457 Brake Control Adapter Harness Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Quick Plug	View on Amazon
CURT Fits: all 2021 3500 engines	51458	🇺🇸 US 🇨🇦 CA	Brake Control Adapter Harness Fitment notes — CURT 51458 Brake Control Adapter Harness Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or 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 3500 engines	55415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM Socket Fitment notes — CURT 55415 Replacement 7-Way RV Blade OEM Socket Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Factory Tow Package	View on Amazon
CURT Popular Fits: all 2021 3500 engines	56229	🇺🇸 US 🇨🇦 CA	7-Way USCAR Electrical ConnectorLength: 24 in. Fitment notes — CURT 56229 7-Way USCAR Electrical ConnectorLength: 24 in.Bonded Wire Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Factory Tow Package	View on Amazon
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 3500 engines	TC656	🇺🇸 US 🇨🇦 CA	with Towing PackageOE Style	View on Amazon
CURT Fits: all 2021 3500 engines	56415	🇺🇸 US 🇨🇦 CA	Replacement 7-Way RV Blade OEM SocketTwist-In Fitment notes — CURT 56415 Replacement 7-Way RV Blade OEM SocketTwist-In Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 engines	55515	🇺🇸 US 🇨🇦 CA	Custom Wiring ConnectorOE 4-Way Flat Fitment notes — CURT 55515 Custom Wiring ConnectorOE 4-Way FlatPlugs Into USCAR Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or TradesmanReplacement2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 engines	56515	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector5-Way Flat Fitment notes — CURT 56515 Custom Wiring Connector5-Way Flat Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 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 Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 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 Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman	View on Amazon
CURT Fits: all 2021 3500 engines	55384	🇺🇸 US 🇨🇦 CA	Custom Wiring Connector4-Way Flat Fitment notes — CURT 55384 Custom Wiring Connector4-Way FlatRetains Use of 7 Way Round Connector Fits: Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman2-Wire Systemwith Factory Tow Packag or: Laramie or Limited or Tradesman2-Wire System	View on Amazon
CURT Fits: all 2021 3500 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 Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesmanwith Factory Tow PackagePlugs Into USCAR	View on Amazon
CURT Fits: all 2021 3500 engines	56584	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness5-Way Flat Fitment notes — CURT 56584 Custom Wiring Harness5-Way FlatRetains Use Of 7-Way OEM Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman2-Wire Systemwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 engines	58995	🇺🇸 US 🇨🇦 CA	Towed-Vehicle RV HarnessConnects Towed Vehicle To RV Using A Standard 4-Way Flat Trailer Plug Fitment notes — CURT 58995 Towed-Vehicle RV HarnessConnects Towed Vehicle To RV Using A Standard 4-Way Flat Trailer Plug Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman	View on Amazon
DORMAN Fits: all 2021 3500 engines	924611	🇺🇸 US 🇨🇦 CA		View on Amazon
MOPAR Fits: all 2021 3500 engines	68573359AA	🇺🇸 US 🇨🇦 CA	Fits Mega CabHD 4WD Fitment notes — MOPAR 68573359AA Fits: Mega CabHD 4WD or: Regular Cab8 Foot BedHD 4WD or: Crew Cab8' BoxHD 4WD or: Crew Cab Wheelbase 2HD 4WD	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	TC654	🇺🇸 US 🇨🇦 CA	with Towing Packagewith 7 Way	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 3500 engines	56475	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness Extension Fitment notes — CURT 56475 Custom Wiring Harness Extension Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman20"Plugs Into USCARwith Factory Tow Package	View on Amazon
CURT Fits: all 2021 3500 engines	56070010	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness Extension7 ft. Fitment notes — CURT 56070010 Custom Wiring Harness Extension7 ft.Pack of 10 Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman7 WayFor 5th Wheel or Gooseneck In Bed Connection	View on Amazon
CURT Fits: all 2021 3500 engines	56000010	🇺🇸 US 🇨🇦 CA	Custom Wiring Harness ExtensionPack of 10 Fitment notes — CURT 56000010 Custom Wiring Harness ExtensionPack of 10Length: 10 ft. Big Horn or Laramie or Limited or Limited Longhorn or Lone Star or Tradesman7 WayFor 5th Wheel or Gooseneck In Bed Connection	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: 6.4L V8	68224246AA	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisExcept Power Take Off Preparation - Left Side Fitment notes — MOPAR 68224246AA Fits: Cab ChassisExcept Power Take Off Preparation - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisExcept Power Take Off Preparation - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisPower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 16 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisExcept Power Take Off Preparation - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisPower Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisPower Take Off Preparation - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD TransHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	68516601AB	🇺🇸 US 🇨🇦 CA	Fits 180 Amp Alternator, Dual Rear WheelsCrew Cab Wheelbase 2 Fitment notes — MOPAR 68516601AB Fits: 180 Amp Alternator, Dual Rear WheelsCrew Cab Wheelbase 28-Speed Automatic 8HP75-LCV Transmission or: 180 Amp Alternator, Dual Rear WheelsCrew Cab8 Foot Bed8-Speed Automatic 8HP75-LCV Transmission or: 180 Amps Alternator, Dual Rear WheelsRegular Cab8 Foot Bed8-SPD Auto 8HP75-LCV Transmission	View on Amazon
MOPAR Fits: 6.4L V8	68516602AB	🇺🇸 US 🇨🇦 CA	Fits 180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab Crew Cab Fitment notes — MOPAR 68516602AB Fits: 180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab Crew Cab8' Box8-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab Wheelbase 28-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case, Dual Rear WheelsMega Cab8-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, MAN Shift-On-The-Fly Transfer Case, Dual Rear WheelsRegular Cab8 Foot Bed8-SPD Auto 8HP75-LCV TransmissionHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	68516603AB	🇺🇸 US 🇨🇦 CA	Fits 180 Amp Alternator, Elec Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab Wheelbase 2 Fitment notes — MOPAR 68516603AB Fits: 180 Amp Alternator, Elec Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab Wheelbase 28-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, Elec Shift-On-The-Fly Transfer Case, Dual Rear WheelsCrew Cab8' Box8-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, Elec Shift-On-The-Fly Transfer Case, Dual Rear WheelsMega Cab8-SPD Auto 8HP75-LCV TransmissionHD 4WD or: 180 Amp Alternator, Elec Shift-On-The-Fly Transfer Case, Dual Rear WheelsRegular Cab8 Foot Bed8-SPD Auto 8HP75-LCV TransmissionHD 4WD	View on Amazon
MOPAR Fits: 6.4L V8	68516604AB	🇺🇸 US 🇨🇦 CA	Fits 220 Amps Alternator, Dual Rear WheelsExc. Dual Alternators Rated At 380 Amps Fitment notes — MOPAR 68516604AB Fits: 220 Amps Alternator, Dual Rear WheelsExc. Dual Alternators Rated At 380 AmpsCrew Cab Wheelbase 28-SPD Auto 8HP75-LCV Transmission or: 220 Amps Alternator, Dual Rear WheelsExc. Dual Alternators Rated At 380 AmpsCrew Cab8' Box8-SPD Auto 8HP75-LCV Transmission or: 220 Amps Alternator, Dual Rear WheelsExc. Dual Alternators Rated At 380 AmpsRegular Cab8 Foot Bed8-SPD Auto 8HP75-LCV Transmission	View on Amazon
MOPAR Fits: 6.4L V8	68516605AB	🇺🇸 US 🇨🇦 CA	Fits Dual Alternators Rated At 380 Amps, Dual Rear WheelsCrew Cab Wheelbase 2 Fitment notes — MOPAR 68516605AB Fits: Dual Alternators Rated At 380 Amps, Dual Rear WheelsCrew Cab Wheelbase 28-SPD Auto 8HP75-LCV Transmission or: Dual Alternators Rated At 380 Amps, Dual Rear WheelsCrew Cab8' Box8-SPD Auto 8HP75-LCV Transmission or: Dual Alternators Rated At 380 Amps, Dual Rear WheelsRegular Cab8 Foot Bed8-SPD Auto 8HP75-LCV Transmission	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484712AB	🇺🇸 US 🇨🇦 CA	Fits Cummins EngineElectric Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68484712AB Fits: Cummins EngineElectric Shift-On-The-Fly Transfer CaseRegular Cab8 Foot Bed6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins engineElectric Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 26 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineElectric Shift-On-The-Fly Transfer CaseMega Cab6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineElectric Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE TransmissionHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484713AB	🇺🇸 US 🇨🇦 CA	Fits Cummins engineManual Shift-On-The-Fly Transfer Case Fitment notes — MOPAR 68484713AB Fits: Cummins engineManual Shift-On-The-Fly Transfer CaseExcept Underground CalibrationCrew Cab Wheelbase 26 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineManual Shift-On-The-Fly Transfer CaseExcept Underground CalibrationMega Cab6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineManual Shift-On-The-Fly Transfer CaseExcept Underground CalibrationRegular Cab8 Foot Bed6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineManual Shift-On-The-Fly Transfer CaseExcept Underground CalibrationCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE TransmissionHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484714AB	🇺🇸 US 🇨🇦 CA	Fits Cummins EngineExcept Underground Calibration Fitment notes — MOPAR 68484714AB Fits: Cummins EngineExcept Underground CalibrationCrew Cab Wheelbase 26 Speed Automatic 68RFE Transmission or: Cummins EngineExcept Underground CalibrationRegular Cab8 Foot Bed6 Speed Automatic 68RFE Transmission or: Cummins EngineExcept Underground CalibrationCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE Transmission	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484715AB	🇺🇸 US 🇨🇦 CA	Fits Cummins EngineMAN Shift-On-The-Fly Transfer Case, Underground Calibration Fitment notes — MOPAR 68484715AB Fits: Cummins EngineMAN Shift-On-The-Fly Transfer Case, Underground CalibrationCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineMAN Shift-On-The-Fly Transfer Case, Underground CalibrationCrew Cab Wheelbase 26 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineMAN Shift-On-The-Fly Transfer Case, Underground CalibrationMega Cab6 Speed Automatic 68RFE TransmissionHD 4WD or: Cummins EngineMAN Shift-On-The-Fly Transfer Case, Underground CalibrationRegular Cab8 Foot Bed6 Speed Automatic 68RFE TransmissionHD 4WD	View on Amazon
MOPAR Fits: 6.7L L6 DIESEL Turbocharged	68484716AB	🇺🇸 US 🇨🇦 CA	Fits Cummins EngineUnderground Calibration Fitment notes — MOPAR 68484716AB Fits: Cummins EngineUnderground CalibrationCrew Cab Wheelbase 26 Speed Automatic 68RFE Transmission or: Cummins EngineUnderground CalibrationRegular Cab8 Foot Bed6 Speed Automatic 68RFE Transmission or: Cummins EngineUnderground CalibrationCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE Transmission	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 3500 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 3500 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 3500 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 3500 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.

Window Motor Connector

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	S1922	🇺🇸 US 🇨🇦 CA	Connector Shape: RectangleWiring Harness Length (mm): 254 Fitment notes — STANDARD MOTOR PRODUCTS S1922 Connector Shape: RectangleWiring Harness Length (mm): 254Front	View on Amazon

This table covers the harness connectors at the Window 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.

Buying Electrical Connector Parts for a 2021 Ram 3500

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: Trailer Connector and Transmission-Automatic Wiring Harness / Connector .

Frequently Asked Questions

How many electrical connector parts fit the 2021 Ram 3500?

Our catalog currently lists 123 electrical connector parts for the 2021 Ram 3500 across 49 subcategories and 10 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 3500 engines?

Some do. 63 parts fit every engine; the other 60 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 3500?

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 3500 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 3500?

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 3500

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 3500 Years

2026 Ram 3500 2025 Ram 3500 2024 Ram 3500 2023 Ram 3500 2022 Ram 3500 2020 Ram 3500 2019 Ram 3500 2018 Ram 3500 2017 Ram 3500 2016 Ram 3500 2015 Ram 3500 2014 Ram 3500

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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