2021 Ram 3500 Electrical Switch & Relay Parts: OEM & Replacement (103 Parts)

Q: How many electrical switch & relay parts fit the 2021 Ram 3500?

Our catalog currently lists 103 electrical switch & relay parts for the 2021 Ram 3500 across 32 subcategories and 15 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 switch & relay parts differ between 2021 Ram 3500 engines?

Some do. 95 parts fit every engine; the other 8 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 switch & relay problems on a 2021 Ram 3500?

Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.

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 swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.

The 2021 Ram 3500 has 103 electrical switch & relay parts with verified fitment on this page — 32 part types and 15 brands, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each part includes a manufacturer part number and application notes.

On the 2021 Ram 3500, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 34 parts of the 103 listed are Power Window Switch (17 parts), Power Seat Switch (9 parts) and Door Lock Switch (8 parts). The other 29 part types cover the remaining 69 parts.

4WD Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	68368381AF	🇺🇸 US 🇨🇦 CA	Fits Electric Shift-On-The-Fly Transfer CaseMega Cab Fitment notes — MOPAR 68368381AF Fits: Electric Shift-On-The-Fly Transfer CaseMega Cab6 Speed Automatic 68RFE TransmissionHD 4WD or: Electric Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE TransmissionHD 4WD or: Electric Shift-On-The-Fly Transfer CaseRegular Cab8 Foot Bed6 Speed Automatic 68RFE TransmissionHD 4WD or: Electric Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab8' Box6 Speed Auto Aisin AS69RC HD TransHD 4WD or: Electric Shift-On-The-Fly Transfer CaseMega Cab6 Speed Auto Aisin AS69RC HD TransHD 4WD or: Electric Shift-On-The-Fly Transfer CaseRegular Cab8 Foot Bed6 Speed Auto Aisin AS69RC HD TransHD 4WD or: Electric Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 26 Speed Automatic 68RFE TransmissionHD 4WD or: Electric Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 26 Speed Auto Aisin AS69RC HD TransHD 4WD or: Cab ChassisElectric Shift-On-The-Fly Transfer CaseExc. Electronic ShiftCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD Tra	View on Amazon

This table covers the 4WD switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

A/C Compressor Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray Fitment notes — HELLA 933332641 5-Pin ConnectorColor: Black, Gray Clutch Relay	View on Amazon

This table covers the relays that control the A/C Compressor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

A/C Pressure Safety Switch

Brand	Part Number	Markets	Notes	Buy
VEMO Fits: all 2021 3500 engines	V33730052	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the A/C Pressure Safety switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

A/C Refrigerant Pressure Switch

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: all 2021 3500 engines	904620	🇺🇸 US 🇨🇦 CA		View on Amazon
FACET Fits: all 2021 3500 engines	250074	🇺🇸 US 🇨🇦 CA		View on Amazon
FOUR SEASONS Fits: all 2021 3500 engines	37368	🇺🇸 US 🇨🇦 CA	Pressure Switch Fitment notes — FOUR SEASONS 37368 Pressure Switch Transducer	View on Amazon
UAC Fits: all 2021 3500 engines	SW10008C	🇺🇸 US 🇨🇦 CA	Pressure Transducer Fitment notes — UAC SW10008C Pressure Transducer Transducer	View on Amazon

This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Accessory Power Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332531	🇺🇸 US 🇨🇦 CA	4-Pin ConnectorPlug: B Fitment notes — HELLA 933332531 4-Pin ConnectorPlug: BColor: Black	View on Amazon

This table covers the relays that control the Accessory Power circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Adjustable Pedal Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	56046113AA	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable Pedals Fitment notes — MOPAR 56046113AA Fits: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelRegular Cab Chassis Wheelbase 1HD 4WD or: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelCrew Cab Wheelbase 4HD 4WD or: Cab ChassisPower Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelCrew Cab Wheelbase 4HD 4WD	View on Amazon

This table covers the Adjustable Pedal switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Blower Motor Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray	View on Amazon

This table covers the relays that control the Blower Motor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Brake Light Switch

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: all 2021 3500 engines	920626	🇺🇸 US 🇨🇦 CA		View on Amazon
VEMO Fits: all 2021 3500 engines	V33730040	🇺🇸 US 🇨🇦 CA	Electric7 8700AE	View on Amazon
WELLS Fits: all 2021 3500 engines	1S17828	🇺🇸 US 🇨🇦 CA	Mounting Hardware Included: No	View on Amazon

This table covers the pedal-mounted switch that turns on the brake lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Cruise Control Switch

Brand	Part Number	Markets	Notes	Buy
VEMO Fits: all 2021 3500 engines	V33800017	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the Cruise Control switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Defroster Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray	View on Amazon

This table covers the relays that control the Defroster circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Dimmer Switch

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: 6.7L L6 DIESEL Turbocharged	CBS1925	🇺🇸 US 🇨🇦 CA		View on Amazon
WELLS Fits: all 2021 3500 engines	1S11313	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the dimmer switches that select headlamp high and low beam. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Door Lock Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 3500 engines	68262252AC	🇺🇸 US 🇨🇦 CA	Fits FrontLeft Fitment notes — MOPAR 68262252AC Fits: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsCrew Cab Wheelbase 2HD 4WD or: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsMega CabHD 4WD or: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsRegular Cab8 Foot BedHD 4WD or: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsCrew Cab Crew Cab8' BoxHD 4WD	View on Amazon
MOPAR Popular Fits: all 2021 3500 engines	68262253AC	🇺🇸 US 🇨🇦 CA	Fits FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down Fitment notes — MOPAR 68262253AC Fits: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownExc. Power-Folding MirrorsRegular Cab Chassis Wheelbase 1HD 4WD<10,000 LB GVW or: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownExc. Power-Folding MirrorsCrew Cab Wheelbase 2HD 4WD or: FrontLeftSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownExc. Power-Folding MirrorsMega CabHD 4WD or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownExc. Power-Folding MirrorsCrew Cab Wheelbase 4<10,000 LB GVW or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownExc. Power-Folding MirrorsCrew Cab Wheelbase 4HD 4WD<10,000 LB GVW or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownExc. Power-Folding MirrorsRegular Cab Chassis Wheelbase 1<10,000 LB GVW or: FrontCab ChassisSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownCrew Cab Wheelbase 4HD 4	View on Amazon
MOPAR Fits: all 2021 3500 engines	68268251AC	🇺🇸 US 🇨🇦 CA	Fits FrontRight Fitment notes — MOPAR 68268251AC Fits: FrontRightSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownCrew Cab Wheelbase 2HD 4WD or: FrontRightSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownCrew Cab8' BoxHD 4WD or: FrontRightSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownMega CabHD 4WD or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownCrew Cab Wheelbase 4<10K Lb. Cab Chassis or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	68382476AB	🇺🇸 US 🇨🇦 CA	Fits FrontSpeed Sensitive Power Locks, Power Windows, Front 1-Touch Down Fitment notes — MOPAR 68382476AB Fits: FrontSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownExc. Power-Folding MirrorsRegular Cab Chassis Wheelbase 1HD 4WD<10,000 LB GVW or: FrontCab ChassisSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownRegular Cab Chassis Wheelbase 1HD 4WD or: FrontCab ChassisSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownRegular Cab Chassis Wheelbase 2HD 4WD or: FrontLeftSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownExc. Power-Folding MirrorsRegular Cab8 Foot BedHD 4WD or: FrontSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownExc. Power-Folding MirrorsRegular Cab Chassis Wheelbase 1<10,000 LB GVW	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1647	🇺🇸 US 🇨🇦 CA	Front Right4 door Fitment notes — STANDARD MOTOR PRODUCTS DWS1647 Front Right4 doorwithout Luxury Package	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1994	🇺🇸 US 🇨🇦 CA	Right2 door	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1837	🇺🇸 US 🇨🇦 CA	Front Right4 door Fitment notes — STANDARD MOTOR PRODUCTS DWS1837 Front Right4 doorwith Luxury Package	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1899	🇺🇸 US 🇨🇦 CA	Front Left2 door Fitment notes — STANDARD MOTOR PRODUCTS DWS1899 Front Left2 doorwithout Power Folding Mirrorswith Auto Down	View on Amazon

This table covers the Door Lock switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Glove Box Lamp Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	4565022	🇺🇸 US 🇨🇦 CA	Fits Glove Box LampMega Cab Fitment notes — MOPAR 4565022 Fits: Glove Box LampMega CabHD 4WD or: Glove Box LampRegular Cab, 8 Foot BedHD 4WD or: Cab ChassisGlove Box LampRegular Cab Chassis Wheelbase 2HD 4WD or: Glove Box LampCrew Cab Crew Cab8' BoxHD 4WD or: Glove Box LampCrew Cab Wheelbase 2HD 4WD or: Glove Box LampCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Glove Box LampCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Glove Box LampRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Glove Box LampRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	68312671AB	🇺🇸 US 🇨🇦 CA	Fits Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 2 Fitment notes — MOPAR 68312671AB Fits: Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 2HD 4WD or: Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Cab ChassisDual Glove Boxes or Glove Box LampRegular Cab Chassis Wheelbase 2HD 4WD or: Dual Glove Boxes or Glove Box LampCrew Cab8' BoxHD 4WD or: Dual Glove Boxes or Glove Box LampMega CabHD 4WD or: Dual Glove Boxes or Glove Box LampRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Dual Glove Boxes or Glove Box LampRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Dual Glove Boxes or Glove Box LampRegular Cab, 8 Foot BedHD 4WD	View on Amazon
ROSTRA Fits: all 2021 3500 engines	651381	🇺🇸 US 🇨🇦 CA		View on Amazon
WELLS Fits: all 2021 3500 engines	1S2892	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the Glove Box Lamp switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Headlamp Switch

Economy

Brand	Part Number	Markets	Notes	Buy
AUTOTECNICA Fits: all 2021 3500 engines	RM1320829	🇺🇸 US 🇨🇦 CA	Fog Lamps	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 3500 engines	HLS1773	🇺🇸 US 🇨🇦 CA	with Rear Fog Lightwith Fog Lights Fitment notes — STANDARD MOTOR PRODUCTS HLS1773 with Rear Fog Lightwith Fog Lightswith Automatic HeadlightsDash Mounted	View on Amazon
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 3500 engines	HLS1772	🇺🇸 US 🇨🇦 CA	Except Rear Fog Lightswith Fog Lights Fitment notes — STANDARD MOTOR PRODUCTS HLS1772 Except Rear Fog Lightswith Fog Lightswith Automatic HeadlightsDash Mounted	View on Amazon
MOPAR Fits: all 2021 3500 engines	68373900AB	🇺🇸 US 🇨🇦 CA	Fits Cargo Lamp or Center High Mount Stop Lamp with CameraExc. Front Fog Lamps Fitment notes — MOPAR 68373900AB Fits: Cargo Lamp or Center High Mount Stop Lamp with CameraExc. Front Fog Lamps or: Front LED Fog Lamps or Overhead Ash Tray/Cupholder Lamp or: Rear Fog LampsCrew Cab Wheelbase 2HD 4WD or: Cargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Fog Lamps or: Front LED Fog Lamps or Overhead Ash Tray/Cupholder LampCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Cargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Fog Lamps or: Front LED Fog Lamps or Overhead Ash Tray/Cupholder LampCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Cab ChassisCargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Fog Lamps or: Front LED Fog Lamps or Overhead Ash Tray/Cupholder LampRegular Cab Chassis Wheelbase 2HD 4WD or: Cargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Fog Lamps or: Front LED Fog Lamps or Overhead	View on Amazon
MOPAR Fits: all 2021 3500 engines	68373903AB	🇺🇸 US 🇨🇦 CA	Fits Front Fog Lamps Fitment notes — MOPAR 68373903AB Fits: Front Fog Lamps or: Front LED Fog LampsCargo Lamp or Center High Mount Stop Lamp with CameraExc. Overhead Ash Tray/Cupholder Lamp or: Rear Fog LampsCrew Cab Wheelbase 2HD 4WD or: Cargo Lamp or Center High Mount Stop Lamp with CameraFront Fog Lamps or: Front LED Fog LampsExc. Overhead Ash Tray/Cupholder Lamp or AUX Reverse Lamps, Mirror-MountedCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Cargo Lamp or Center High Mount Stop Lamp with CameraFront Fog Lamps or: Front LED Fog LampsExc. Overhead Ash Tray/Cupholder Lamp or AUX Reverse Lamps, Mirror-MountedCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Cab ChassisCargo Lamp or Center High Mount Stop Lamp with CameraFront Fog Lamps or: Front LED Fog LampsExc. Overhead Ash Tray/Cupholder Lamp or AUX Reverse Lamps, Mirror-MountedRegular Cab Chassis Wheelbase 2HD 4WD or: Cargo Lamp or Center High Mount Stop Lamp with CameraFront Fog Lamps or: Front LED Fog LampsExc. Overhead Ash Tray/Cupholder Lamp or AUX Reverse Lamps, M	View on Amazon
MOPAR Fits: all 2021 3500 engines	68156065AC	🇺🇸 US 🇨🇦 CA	Fits Front Fog Lamps Fitment notes — MOPAR 68156065AC Fits: Front Fog Lamps or: Front LED Fog Lamps, Overhead Console, Overhead Ash Tray/Cupholder LampCargo Lamp or Center High Mount Stop Lamp with CameraExc. Rear Fog Lamps or: Front Door Accent Lighting or: Rear Door Accent LightingCrew Cab Wheelbase 2HD 4WD or: Cab ChassisFront Fog Lamps or: Front LED Fog Lamps, Overhead Ash Tray/Cupholder Lamp, Overhead Console, Cargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedCargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Door Accent Lighting or: Rear Door Accent LightingCrew Cab Wheelbase 4HD 4WD or: Cab ChassisFront Fog Lamps or: Front LED Fog Lamps, Overhead Ash Tray/Cupholder Lamp, Overhead Console, Cargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedCargo Lamp or Center High Mount Stop Lamp with Camera or AUX Reverse Lamps, Mirror-MountedExc. Front Door Accent Lighting or: Rear Door Accent LightingRegular Cab Ch	View on Amazon

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	HLS1809	🇺🇸 US 🇨🇦 CA	without Front Fog Lightswith Cargo Area Light Fitment notes — STANDARD MOTOR PRODUCTS HLS1809 without Front Fog Lightswith Cargo Area Lightwith Automatic Headlights	View on Amazon

This table covers the column or dash switches that control the exterior lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Hood Ajar Indicator Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	4707875AB	🇺🇸 US 🇨🇦 CA	Fits Ram Box Cargo Management SystemRemote Keyless Entry Fitment notes — MOPAR 4707875AB Fits: Ram Box Cargo Management SystemRemote Keyless EntryMega CabHD 4WD or: RAMBOX CARGO MANAGEMENT SYSTEM, REMOTE KEYLESS ENTRYMega CabHD 4WD or: Rambox Cargo Management SystemRemote Keyless EntryCrew Cab Wheelbase 2HD 4WD or: Rambox Cargo Management System, Remote Keyless EntryCrew Cab Wheelbase 2HD 4WD	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DS2264	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the Hood Ajar Indicator switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

HVAC Control Switch / Panel

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	68370121AB	🇺🇸 US 🇨🇦 CA	LowerUpper Fitment notes — MOPAR 68370121AB LowerUpper Fits: A/C, Diesel Exhaust BrakeExc. Exterior Mirrors with Heating Element or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or: Rear Window DefrosterCrew Cab Wheelbase 2HD 4WD or: Cab ChassisA/C, DIESEL Exhaust BrakeExc. Exterior Mirrors with Heating Element or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or: Rear Window DefrosterCrew Cab Wheelbase 4HD 4WD or: A/C, DIESEL Exhaust BrakeExc. Exterior Mirrors with Heating Element or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or: Rear Window DefrosterCrew Cab Crew Cab8' BoxHD 4WD or: A/C, DIESEL Exhaust BrakeExc. Exterior Mirrors with Heating Element or Lane Departure Warning Plus or Heated Steering Wheel or Vent	View on Amazon
MOPAR Fits: all 2021 3500 engines	68370122AB	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68370122AB Lower Fits: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayCrew Cab Wheelbase 2HD 4WD or: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayCrew Cab Crew Cab8' BoxHD 4WD or: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayMega CabHD 4WD or: Air Conditioning, Diesel Exhaust Brake, Ext	View on Amazon
MOPAR Fits: all 2021 3500 engines	68370122AC	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68370122AC Lower Fits: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayCrew Cab Wheelbase 2HD 4WD or: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayCrew Cab Crew Cab8' BoxHD 4WD or: Air Conditioning, Diesel Exhaust Brake, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" Touchscreen DisplayMega CabHD 4WD or: Air Conditioning, Diesel Exhaust Brake, Ext	View on Amazon
MOPAR Fits: all 2021 3500 engines	68370124AB	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68370124AB Lower Fits: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Wheelbase 2HD 4WD or: Cab ChassisAir Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Wheelbase 4HD 4WD or: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Crew Cab8' BoxHD 4WD or: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front	View on Amazon
MOPAR Fits: all 2021 3500 engines	68370124AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68370124AD Lower Fits: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Wheelbase 2HD 4WD or: Cab ChassisAir Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Wheelbase 4HD 4WD or: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen DisplayCrew Cab Crew Cab8' BoxHD 4WD or: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Diesel Exhaust BrakeExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front	View on Amazon

This table covers the HVAC Control Switch panels.

Ignition Starter Switch

Brand	Part Number	Markets	Notes	Buy
WELLS Fits: all 2021 3500 engines	1S17758	🇺🇸 US 🇨🇦 CA	with Push Button Switch	View on Amazon

This table covers the ignition switches that feed the starter circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Instrument Cluster Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 3500 engines	68309259AD	🇺🇸 US 🇨🇦 CA	Fits Trailer Brake ControlCrew Cab Wheelbase 2 Fitment notes — MOPAR 68309259AD Fits: Trailer Brake ControlCrew Cab Wheelbase 2HD 4WD or: Trailer Brake ControlCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Trailer Brake ControlCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Trailer Brake ControlCrew Cab8' BoxHD 4WD or: Trailer Brake ControlMega CabHD 4WD or: Trailer Brake ControlRegular Cab8 Foot BedHD 4WD or: Cab ChassisTrailer Brake ControlRegular Cab Chassis Wheelbase 2HD 4WD or: Trailer Brake ControlRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Trailer Brake ControlRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab Chassis	View on Amazon
MOPAR Popular Fits: all 2021 3500 engines	68309262AD	🇺🇸 US 🇨🇦 CA	Fits Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black Switches Fitment notes — MOPAR 68309262AD Fits: Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesCrew Cab Wheelbase 2HD 4WD or: Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesCrew Cab Crew Cab8' BoxHD 4WD or: Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesMega CabHD 4WD or: Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesRegular Cab8 Foot BedHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68309259AC	🇺🇸 US 🇨🇦 CA	Fits Trailer Brake ControlRegular Cab Chassis Wheelbase 1 Fitment notes — MOPAR 68309259AC Fits: Trailer Brake ControlRegular Cab Chassis Wheelbase 1HD 2WD<10K Lb. Cab CHASSIS or: Trailer Brake ControlMega CabHD 4WD or: Trailer Brake ControlRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Cab ChassisTrailer Brake ControlRegular Cab Chassis Wheelbase 2HD 4WD or: Trailer Brake ControlCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Trailer Brake ControlCrew Cab Wheelbase 4HD 2WD<10,000 LB GVW Fits: Trailer Brake ControlCrew Cab Crew Cab8' BoxHD 2WD or: Trailer Brake ControlRegular Cab, 8 Foot BedHD 4WD or: Trailer Brake ControlRegular Cab Chassis Wheelbase 1HD 2WD<10,000 LB GVW or: Trailer Brake ControlCrew Cab Wheelbase 4HD 2WD<10K Lb. Cab CHASSIS or: Trailer Brake ControlCrew Cab Wheelbase 2HD 4WD or: Trailer Brake ControlCrew Cab Wheelbase 4HD 4WD<10,000 LB GVW	View on Amazon
MOPAR Fits: all 2021 3500 engines	68309261AD	🇺🇸 US 🇨🇦 CA	Fits Exc. Auto Level Rear Air Suspension Or Diesel Exhaust Brake Or Park Sense Rear Park Assist System Or Park Sense Front/Rear Park Assist System Or Black SwitchesMega Cab Fitment notes — MOPAR 68309261AD Fits: Exc. Auto Level Rear Air Suspension Or Diesel Exhaust Brake Or Park Sense Rear Park Assist System Or Park Sense Front/Rear Park Assist System Or Black SwitchesMega CabHD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesCrew Cab Crew Cab8' BoxHD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesCrew Cab Wheelbase 2HD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesRegular Cab8 Foot BedHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68309269AD	🇺🇸 US 🇨🇦 CA	Fits Exc. Auto Level Rear Air Suspension Or Diesel Exhaust Brake Or Park Sense Rear Park Assist System Or Park Sense Front/Rear Park Assist System Or Black SwitchesMega Cab Fitment notes — MOPAR 68309269AD Fits: Exc. Auto Level Rear Air Suspension Or Diesel Exhaust Brake Or Park Sense Rear Park Assist System Or Park Sense Front/Rear Park Assist System Or Black SwitchesMega CabHD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesCrew Cab Crew Cab8' BoxHD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesCrew Cab Wheelbase 2HD 4WD or: Exc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Parksense Rear Park Assist System or Parksense Front/Rear Park Assist System or Black SwitchesRegular Cab8 Foot BedHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68375183AB	🇺🇸 US 🇨🇦 CA	Fits Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black Switches Fitment notes — MOPAR 68375183AB Fits: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesCrew Cab Wheelbase 2HD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesCrew Cab Crew Cab8' BoxHD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesMega CabHD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesRegular Cab8 Foot BedHD 4WD	View on Amazon
MOPAR Fits: all 2021 3500 engines	68375184AB	🇺🇸 US 🇨🇦 CA	Fits Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black Switches Fitment notes — MOPAR 68375184AB Fits: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesCrew Cab Wheelbase 2HD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesCrew Cab Crew Cab8' BoxHD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesMega CabHD 4WD or: Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesRegular Cab8 Foot BedHD 4WD	View on Amazon

This table covers the Instrument Cluster switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Micro Plug Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray	View on Amazon

This table covers the relays that control the Micro Plug circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Multi-Function Relay

Brand	Part Number	Markets	Notes	Buy
WELLS Fits: all 2021 3500 engines	1R2491	🇺🇸 US 🇨🇦 CA	with Stamping # 4671886AA	View on Amazon

This table covers the relays that control the Multi-Function circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Oil Pressure Sender / Switch

Economy

Brand	Part Number	Markets	Notes	Buy
DORMAN Popular Fits: 6.4L V8	987010	🇺🇸 US 🇨🇦 CA		View on Amazon
HOLSTEIN Fits: 6.4L V8	2OPS0409	🇺🇸 US 🇨🇦 CA		View on Amazon
VEMO Fits: 6.7L L6 DIESEL Turbocharged	V33730038	🇺🇸 US 🇨🇦 CA	Engine Code ETM	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: 6.4L V8	PS1000	🇺🇸 US 🇨🇦 CA	Terminal Type: Pins	View on Amazon
MOPAR Fits: 6.4L V8	68334877AA	🇺🇸 US 🇨🇦 CA	Fits Mega CabHD 4WD Fitment notes — MOPAR 68334877AA Fits: Mega CabHD 4WD or: Regular Cab8 Foot BedHD 4WD or: Crew Cab8' BoxHD 4WD or: Cab ChassisRegular Cab Chassis Wheelbase 2HD 4WD or: Cab ChassisHeavy Duty HEMI MDS EngineRegular Cab Chassis Wheelbase 1<10,000 LB GVW or: Cab ChassisHeavy Duty HEMI MDS EngineRegular Cab Chassis Wheelbase 1HD 4WD<10,000 LB GVW or: Crew Cab Wheelbase 2HD 4WD or: Cab ChassisHeavy Duty HEMI MDS EngineCrew Cab Wheelbase 4<10,000 LB GVW or: Cab ChassisHeavy Duty HEMI MDS EngineCrew Cab Wheelbase 4HD 4WD<10,000 LB GVW	View on Amazon
MOPAR Fits: 6.4L V8	68019700AA	🇺🇸 US 🇨🇦 CA	Fits Cab ChassisPower Take Off Prep - Left Side Fitment notes — MOPAR 68019700AA Fits: Cab ChassisPower Take Off Prep - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisExc. Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 26 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisExc. Power Take Off Prep - Left SideRegular Cab Chassis Wheelbase 16 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 ChassisPower Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD TransHD 4WD or: Cab ChassisExc. Power Take Off Prep - Left SideCrew Cab Wheelbase 46 Speed Auto Aisin AS66RC HD TransHD 4WD	View on Amazon
WELLS Fits: all 2021 3500 engines	1S16094	🇺🇸 US 🇨🇦 CA	with 3 Terminals	View on Amazon

This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.

Outside Mirror Switch

Economy

Brand	Part Number	Markets	Notes	Buy
ULTRA-POWER Fits: all 2021 3500 engines	DWS1711	🇺🇸 US 🇨🇦 CA	RemoteExcept Power Folding Mirrors Fitment notes — ULTRA-POWER DWS1711 RemoteExcept Power Folding Mirrors4 DR	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1899	🇺🇸 US 🇨🇦 CA	2 doorwithout Power Folding Mirrors Fitment notes — STANDARD MOTOR PRODUCTS DWS1899 2 doorwithout Power Folding Mirrorswith Auto Down	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1711	🇺🇸 US 🇨🇦 CA	4 doorwithout Power Folding Mirrors	View on Amazon

This table covers the Outside Mirror switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Oxygen (O2) Sensor Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray Fitment notes — HELLA 933332641 5-Pin ConnectorColor: Black, Gray Heater Relay	View on Amazon

This table covers the relays that control the Oxygen (O2) Sensor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Parking Brake Switch

Brand	Part Number	Markets	Notes	Buy
VEMO Fits: all 2021 3500 engines	V33730152	🇺🇸 US 🇨🇦 CA	Fits Cab & ChassisBody code DF Fitment notes — VEMO V33730152 Fits: Cab & ChassisBody code DF or: 4WDExtended Crew Cab PickupBody code D2 or: Crew Cab Pickup or Standard Cab PickupBody code D2 or: RWDExtended Crew Cab Pickupwith Body code: DF	View on Amazon

This table covers the Parking Brake switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Parking Lamp Relay

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	RY1627	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the relays that control the Parking Lamp circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Power Seat Switch

Economy

Brand	Part Number	Markets	Notes	Buy
SKP Popular Fits: all 2021 3500 engines	SKPSW174	🇺🇸 US 🇨🇦 CA	Front Rightwith 8 Way Power Seat	View on Amazon
DORMAN Fits: all 2021 3500 engines	901477	🇺🇸 US 🇨🇦 CA	Front Left8 Way Fitment notes — DORMAN 901477 Front Left8 WayHigh Current	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 3500 engines	56049433AF	🇺🇸 US 🇨🇦 CA	EconomyLowline Fitment notes — MOPAR 56049433AF EconomyLowlineSpecial Fits: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Crew Cab8' BoxHD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab8 Foot BedHD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Cab ChassisDriver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryMega CabHD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver	View on Amazon
MOPAR Fits: all 2021 3500 engines	56049432AF	🇺🇸 US 🇨🇦 CA	Fits Front Passenger Seat - Power Adjust 8-WayMega Cab Fitment notes — MOPAR 56049432AF Fits: Front Passenger Seat - Power Adjust 8-WayMega CabHD 4WD or: Front Passenger Seat - Power Adjust 8-WayRegular Cab8 Foot BedHD 4WD or: Front Passenger Seat - Power Adjust 8-WayCrew Cab8' BoxHD 4WD or: Cab ChassisFront Passenger Seat - Power Adjust 8-WayRegular Cab Chassis Wheelbase 2HD 4WD or: Front Passenger Seat - Power Adjust 8-WayRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab Chassis or: Front Passenger Seat - Power Adjust 8-WayRegular Cab Chassis Wheelbase 1<10K Lb. Cab Chassis or: Front Passenger Seat - Power Adjust 8-WayCrew Cab Wheelbase 2HD 4WD or: Front Passenger Seat - Power Adjust 8-WayCrew Cab Wheelbase 4<10K Lb. Cab Chassis or: Front Passenger Seat - Power Adjust 8-WayCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab Chassis	View on Amazon
MOPAR Fits: all 2021 3500 engines	56049431AF	🇺🇸 US 🇨🇦 CA	Fits Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Crew Cab Fitment notes — MOPAR 56049431AF Fits: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Crew Cab8' BoxHD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab8 Foot BedHD 4WD or: Cab ChassisDriver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryMega CabHD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Radio/Driver	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	PSW126	🇺🇸 US 🇨🇦 CA	Left	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	PSW127	🇺🇸 US 🇨🇦 CA	Front Leftwith Memory Seats	View on Amazon

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 3500 engines	56049433AG	🇺🇸 US 🇨🇦 CA	Fits Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals Memory Fitment notes — MOPAR 56049433AG Fits: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Cab ChassisDriver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Crew Cab8' BoxHD 4WD or: Driver Seat - Power Adjust 8-WayExcep	View on Amazon
MOPAR Fits: all 2021 3500 engines	56049431AG	🇺🇸 US 🇨🇦 CA	Fits Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2 Fitment notes — MOPAR 56049431AG Fits: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 4HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 4<10K Lb. Cab CHASSIS or: Cab ChassisDriver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 2HD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Crew Cab8' BoxHD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryMega CabHD 4WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 1<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab Chassis Wheelbase 1HD 4WD<10K Lb. Cab CHASSIS or: Driver Seat - Power Adjust 8-Way, Ra	View on Amazon

This table covers the Power Seat switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Power Window Switch

Economy

Brand	Part Number	Markets	Notes	Buy
DORMAN Popular Fits: all 2021 3500 engines	901873	🇺🇸 US 🇨🇦 CA	Front Right4 Door	View on Amazon
DORMAN Popular Fits: all 2021 3500 engines	901998	🇺🇸 US 🇨🇦 CA	Front Left4 door Fitment notes — DORMAN 901998 Front Left4 doorwithout Power Folding Mirrors	View on Amazon
DORMAN Fits: all 2021 3500 engines	920547	🇺🇸 US 🇨🇦 CA	Front Right2 door	View on Amazon
DORMAN Fits: all 2021 3500 engines	920507	🇺🇸 US 🇨🇦 CA	Fits Rear Right4 Door Fitment notes — DORMAN 920507 Fits: Rear Right4 Door or: Rear Left4 Door	View on Amazon
DORMAN Fits: all 2021 3500 engines	920502	🇺🇸 US 🇨🇦 CA	Front Left4 door Fitment notes — DORMAN 920502 Front Left4 doorwith Power Folding Mirrors	View on Amazon
SKP Fits: all 2021 3500 engines	SKDWS1899	🇺🇸 US 🇨🇦 CA	Front Left	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 3500 engines	DWS1994	🇺🇸 US 🇨🇦 CA	Right2 door	View on Amazon
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 3500 engines	DWS1899	🇺🇸 US 🇨🇦 CA	Front Left2 door Fitment notes — STANDARD MOTOR PRODUCTS DWS1899 Front Left2 doorwithout Power Folding Mirrorswith Auto Down	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1649	🇺🇸 US 🇨🇦 CA	Rearwithout One Touch Window Open/Close	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS1989	🇺🇸 US 🇨🇦 CA	Connector Shape: Square Fitment notes — STANDARD MOTOR PRODUCTS DWS1989 Connector Shape: Square Front Right	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	DWS2266	🇺🇸 US 🇨🇦 CA	Includes Bezel Fitment notes — STANDARD MOTOR PRODUCTS DWS2266 Includes Bezel Front Left4 Door	View on Amazon
WELLS Fits: all 2021 3500 engines	1S14285	🇺🇸 US 🇨🇦 CA	Rear	View on Amazon
WELLS Fits: all 2021 3500 engines	1S15428	🇺🇸 US 🇨🇦 CA	Front Right	View on Amazon
WELLS Fits: all 2021 3500 engines	1S15526	🇺🇸 US 🇨🇦 CA	Front LeftStandard Cab Pickup Fitment notes — WELLS 1S15526 Front LeftStandard Cab Pickupwith Power Folding Mirrors	View on Amazon
WELLS Fits: all 2021 3500 engines	1S15525	🇺🇸 US 🇨🇦 CA	Front LeftCrew Cab Pickup Fitment notes — WELLS 1S15525 Front LeftCrew Cab Pickupwith Power Folding Mirrors	View on Amazon
WELLS Fits: all 2021 3500 engines	1S14234	🇺🇸 US 🇨🇦 CA	Front LeftCrew Cab Pickup Fitment notes — WELLS 1S14234 Front LeftCrew Cab Pickupwithout Power Folding Mirrors	View on Amazon

Brand	Part Number	Markets	Notes	Buy
AUTOTECNICA Fits: all 2021 3500 engines	CY1322699	🇺🇸 US 🇨🇦 CA	Front Left	View on Amazon

This table covers the switches that command each window motor. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Radiator Fan Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 3500 engines	933332641	🇺🇸 US 🇨🇦 CA	5-Pin ConnectorColor: Black, Gray Fitment notes — HELLA 933332641 5-Pin ConnectorColor: Black, Gray Motor Relay	View on Amazon

This table covers the relays that control the Radiator Fan circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.

Trailer Brake Switch

Brand	Part Number	Markets	Notes	Buy
SKP Fits: all 2021 3500 engines	SKS390	🇺🇸 US 🇨🇦 CA	Switch Only	View on Amazon

This table covers the Trailer Brake switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Transmission-Automatic Fluid Pressure Switch

Economy

Brand	Part Number	Markets	Notes	Buy
FAMOUS BRAND Fits: all 2021 3500 engines	SBA2005	🇺🇸 US 🇨🇦 CA	Automatic Transmission Oil Pressure SwitchAisin Trans	View on Amazon
VEMO Fits: 6.7L L6 DIESEL Turbocharged	V33770047	🇺🇸 US 🇨🇦 CA	Fits 4WDExtended Crew Cab Pickup Fitment notes — VEMO V33770047 Fits: 4WDExtended Crew Cab PickupTrans. code 68RFE or: Crew Cab Pickup or Standard Cab PickupTrans. code 68RFE	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
WELLS Fits: all 2021 3500 engines	1S16124	🇺🇸 US 🇨🇦 CA	Aisin trans.	View on Amazon

This table covers the Transmission-Automatic Fluid Pressure switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Turn Signal Switch

Economy

Brand	Part Number	Markets	Notes	Buy
DORMAN Fits: all 2021 3500 engines	901279	🇺🇸 US 🇨🇦 CA		View on Amazon
VEMO Fits: all 2021 3500 engines	V33730073	🇺🇸 US 🇨🇦 CA		View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	CBS1925	🇺🇸 US 🇨🇦 CA		View on Amazon
WELLS Fits: all 2021 3500 engines	1S11313	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the combination / turn-signal switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Wiper / Washer Switch

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 3500 engines	CBS1925	🇺🇸 US 🇨🇦 CA		View on Amazon
WELLS Fits: all 2021 3500 engines	1S11313	🇺🇸 US 🇨🇦 CA		View on Amazon

This table covers the Wiper / Washer switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.

Buying Electrical Switch & Relay Parts for a 2021 Ram 3500

On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.

Match the engine first. Some electrical switch & relay 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
Cross-reference the manufacturer part number against your old part or a service-manual listing.

Start with the largest groups on this page: Power Window Switch and Power Seat Switch .

Frequently Asked Questions

How many electrical switch & relay parts fit the 2021 Ram 3500?

Our catalog currently lists 103 electrical switch & relay parts for the 2021 Ram 3500 across 32 subcategories and 15 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 switch & relay parts differ between 2021 Ram 3500 engines?

Some do. 95 parts fit every engine; the other 8 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 switch & relay problems on a 2021 Ram 3500?

Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.

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 swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. 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 Connector Engine Exhaust & Emission Fuel & Air Heat & Air Conditioning Ignition Interior Steering Suspension Automatic Transmission Wheel Wiper & Washer

Electrical Switch & Relay 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