2021 Ram 2500 Electrical Switch & Relay Parts: OEM & Replacement (107 Parts)

107 Electrical switch & relay parts are listed for the 2021 Ram 2500, in 31 part types, covering both the 6.4L V8 and the 6.7L L6 DIESEL Turbocharged. Each one has a brand, a manufacturer part number and notes that say where it fits.

The switch and relay system on the 2021 Ram 2500 covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Power Window Switch (19 parts), Power Seat Switch (10 parts) and Door Lock Switch (8 parts). The other 28 part types cover the remaining 70 parts.

4WD Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 2500 engines	68211454AA	🇺🇸 US 🇨🇦 CA	Fits Manual Shift-on-the-Fly Transfer CaseMega Cabor Manual Shift-on-the-Fly Transfer Case Fitment notes — MOPAR 68211454AA Fits: Manual Shift-on-the-Fly Transfer CaseMega Cabor Manual Shift-on-the-Fly Transfer CaseRegular Cab8 Foot Bedor Manual Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab8' Boxor Manual Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 2	View on Amazon
MOPAR Fits: all 2021 2500 engines	68368381AF	🇺🇸 US 🇨🇦 CA	Fits Electric Shift-On-The-Fly Transfer CaseExc. Hill Descent Control Fitment notes — MOPAR 68368381AF Fits: Electric Shift-On-The-Fly Transfer CaseExc. Hill Descent ControlCrew Cab Wheelbase 26 Speed Automatic 68RFE Transmission or: Electric Shift-On-The-Fly Transfer CaseExc. Hill Descent ControlCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE Transmission or: Electric Shift-On-The-Fly Transfer CaseExc. Hill Descent ControlMega Cab6 Speed Automatic 68RFE Transmission or: Electric Shift-On-The-Fly Transfer CaseExc. Hill Descent ControlRegular Cab8 Foot Bed6 Speed Automatic 68RFE Transmission	View on Amazon
MOPAR Fits: all 2021 2500 engines	68370837AF	🇺🇸 US 🇨🇦 CA	Fits Elec Shift-On-The-Fly Transfer Case, Hill Descent ControlCrew Cab Wheelbase 2 Fitment notes — MOPAR 68370837AF Fits: Elec Shift-On-The-Fly Transfer Case, Hill Descent ControlCrew Cab Wheelbase 26 Speed Automatic 68RFE Transmission or: Elec Shift-On-The-Fly Transfer Case, Hill Descent ControlCrew Cab Crew Cab8' Box6 Speed Automatic 68RFE Transmission or: Elec Shift-On-The-Fly Transfer Case, Hill Descent ControlMega Cab6 Speed Automatic 68RFE Transmission or: Elec Shift-On-The-Fly Transfer Case, Hill Descent ControlRegular Cab8 Foot Bed6 Speed Automatic 68RFE Transmission	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 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 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 2500 engines	904620	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
FACET Fits: all 2021 2500 engines	250074	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
FOUR SEASONS Fits: all 2021 2500 engines	37368	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Pressure Switch Fitment notes — FOUR SEASONS 37368 Pressure Switch Transducer	View on Amazon
UAC Fits: all 2021 2500 engines	SW10008C	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	933332531	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	56046113AA	🇺🇸 US 🇨🇦 CA	Fits Power Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering Wheel Fitment notes — MOPAR 56046113AA Fits: Power Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelRegular Cab8 Foot Bedor Power Adjustable PedalsExc. Heated Steering WheelCrew Cab8' Boxor Power Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelMega Cabor Power Adjustable Pedals, Heated Steering WheelCrew Cab8' Boxor Power Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelRegular Cab8 Foot Bedor Power Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelCrew Cab Wheelbase 2or Power Adjustable Pedals with Memory or Power Adjustable Pedals, Heated Steering WheelCrew Cab Wheelbase 2or Power Adjustable Pedals with Memory or Power Adjustable PedalsExc. Heated Steering WheelMega Cab	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 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	920626	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
VEMO Fits: all 2021 2500 engines	V33730040	🇺🇸 US 🇨🇦 CA	Electric7 8700AE	View on Amazon
WELLS Fits: all 2021 2500 engines	1S17828	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 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 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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: all 2021 2500 engines	CBS1925	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
WELLS Fits: all 2021 2500 engines	1S11313	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	68262252AC	🇺🇸 US 🇨🇦 CA	Fits FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding Mirrors Fitment notes — MOPAR 68262252AC Fits: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsCrew Cab Crew Cab8' Box or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & Down, Power-Folding MirrorsCrew Cab Wheelbase 2 or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down, Power-Folding MirrorsMega Cab	View on Amazon
MOPAR Popular Fits: all 2021 2500 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 MirrorsCrew Cab Crew Cab8' Box or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownExc. Power-Folding MirrorsCrew Cab Wheelbase 2 or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownExc. Power-Folding MirrorsMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 engines	68268251AC	🇺🇸 US 🇨🇦 CA	Fits FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & Down Fitment notes — MOPAR 68268251AC Fits: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownCrew Cab Crew Cab8' Box or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch Up & DownCrew Cab Wheelbase 2 or: FrontSpeed Sensitive Power Locks, Power Front Windows, 1-Touch,up & DownMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 engines	68382476AB	🇺🇸 US 🇨🇦 CA	FrontSpeed Sensitive Power Locks, Power Windows, Front 1-Touch Down Fitment notes — MOPAR 68382476AB FrontSpeed Sensitive Power Locks, Power Windows, Front 1-Touch DownExc. Power-Folding MirrorsRegular Cab8 Foot Bed	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1647	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front RightCrew Cab Pickup or Extended Crew Cab Pickup Fitment notes — STANDARD MOTOR PRODUCTS DWS1647 Front RightCrew Cab Pickup or Extended Crew Cab Pickupwithout Luxury Package	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1994	🇺🇸 US 🇨🇦 CA	RightStandard Cab Pickup	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1837	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front RightCrew Cab Pickup or Extended Crew Cab Pickup Fitment notes — STANDARD MOTOR PRODUCTS DWS1837 Front RightCrew Cab Pickup or Extended Crew Cab Pickupwith Luxury Package	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1899	🇺🇸 US 🇨🇦 CA	Front LeftStandard Cab Pickup Fitment notes — STANDARD MOTOR PRODUCTS DWS1899 Front LeftStandard Cab Pickupwithout 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 2500 engines	4565022	🇺🇸 US 🇨🇦 CA	Fits Glove Box LampMega Cabor Glove Box Lamp Fitment notes — MOPAR 4565022 Fits: Glove Box LampMega Cabor Glove Box LampRegular Cab, 8 Foot Bedor Glove Box LampCrew Cab Crew Cab8' Boxor Glove Box LampCrew Cab Wheelbase 2	View on Amazon
MOPAR Fits: all 2021 2500 engines	68312671AB	🇺🇸 US 🇨🇦 CA	Fits Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 2or Dual Glove Boxes or Glove Box Lamp Fitment notes — MOPAR 68312671AB Fits: Dual Glove Boxes or Glove Box LampCrew Cab Wheelbase 2or Dual Glove Boxes or Glove Box LampCrew Cab8' Boxor Dual Glove Boxes or Glove Box LampMega Cabor Dual Glove Boxes or Glove Box LampRegular Cab, 8 Foot Bed	View on Amazon
ROSTRA Fits: all 2021 2500 engines	651381	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
WELLS Fits: all 2021 2500 engines	1S2892	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	RM1320829	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Fog Lamps	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 2500 engines	HLS1773	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	HLS1772	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 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 2or 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 Crew Cab8' Boxor 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 LampsRegular Cab8 Foot Bedor 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 LampsMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 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 2 or: 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 Crew Cab8' Box or: 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 LampsRegular Cab8 Foot Bed or: 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 LampsMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 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 2 or: 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 Crew Cab8' Box or: 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 LightingRegular Cab8 Foot Bed or: 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 LightingMega Cab	View on Amazon

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	HLS1809	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	without Front Fog Lightswith 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 2500 engines	4707875AB	🇺🇸 US 🇨🇦 CA	Fits Ram Box Cargo Management System, REMOTE KEYLESS ENTRYMega Cabor Rambox Cargo Management System, Remote Keyless Entry Fitment notes — MOPAR 4707875AB Fits: Ram Box Cargo Management System, REMOTE KEYLESS ENTRYMega Cabor Rambox Cargo Management System, Remote Keyless EntryCrew Cab Wheelbase 2or Rambox Cargo Management System, Remote Keyless EntryCrew Cab Crew Cab8' Boxor Rambox Cargo Management System, Remote Keyless EntryRegular Cab8 Foot Bed	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DS2264	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	68340280AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68340280AD Lower Fits: A/CExc. Diesel Exhaust Brake or 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 2or A/CExc. Diesel Exhaust Brake or 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' Boxor A/CExc. Diesel Exhaust Brake or 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 DefrosterRegular Cab8 Foot Bedor A/CExc. Diesel Exhaust Brake or Exterior Mirrors with Heating Element or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated	View on Amazon
MOPAR Fits: all 2021 2500 engines	68340281AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68340281AD Lower Fits: Air Conditioning, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Diesel Exhaust Brake or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" TouchsCrew Cab Wheelbase 2or Air Conditioning, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Diesel Exhaust Brake or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" TouchsCrew Cab Crew Cab8' Boxor Air Conditioning, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc. Diesel Exhaust Brake or Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Integrated Center Stack Radio or Disassociated Touchscreen Display or 12.0" TouchsRegular Cab8 Foot Bedor Air Conditioning, Exterior Mirrors with Heating Element or: Rear Window DefrosterExc.	View on Amazon
MOPAR Fits: all 2021 2500 engines	68340283AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68340283AD Lower Fits: A/C, Exterior Mirrors with Heating Element, Integrated Center Stack RadioExc. Lane Departure Warning Plus or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Wheelbase 2or A/C, Exterior Mirrors with Heating Element, Integrated Center Stack RadioExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Crew Cab8' Boxor A/C, Exterior Mirrors with Heating Element, Integrated Center Stack RadioExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeRegular Cab8 Foot Bedor A/C, Exterior Mirrors with Heating Element, Integrated Center Stack RadioExc. Lane Departure Warning PLUS or Heated Steering Wheel or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 engines	68340284AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68340284AD Lower Fits: Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Wheelbase 2or Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Crew Cab8' Boxor Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeRegular Cab8 Foot Bedor Air Conditioning, Exterior Mirrors with Heating Element, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhau	View on Amazon
MOPAR Fits: all 2021 2500 engines	68340286AD	🇺🇸 US 🇨🇦 CA	Lower Fitment notes — MOPAR 68340286AD Lower Fits: Automatic Temp Control A/C with Dual Zone Control, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Wheelbase 2or Automatic Temp Control A/C with Dual Zone Control, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeCrew Cab Crew Cab8' Boxor Automatic Temp Control A/C with Dual Zone Control, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeRegular Cab8 Foot Bedor Automatic Temp Control A/C with Dual Zone Control, Integrated Center Stack Radio, Heated Steering WheelExc. Lane Departure Warning PLUS or Ventilated Front Seats or Disassociated Touchscreen Display or DIESEL Exhaust BrakeMega Cab	View on Amazon

This table covers the HVAC Control Switch panels.

Ignition Starter Switch

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 2500 engines	6QE18TX7AA	🇺🇸 US 🇨🇦 CA	PUSH BUTTON Fitment notes — MOPAR 6QE18TX7AA PUSH BUTTON Fits: Pushbutton StartMega Cabor Pushbutton StartCrew Cab Crew Cab8' Boxor Pushbutton StartRegular Cab, 8 Foot Bedor Pushbutton StartCrew Cab Wheelbase 2	View on Amazon
WELLS Fits: all 2021 2500 engines	1S17758	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	68309259AD	🇺🇸 US 🇨🇦 CA	Fits Trailer Brake ControlCrew Cab Wheelbase 2or Trailer Brake Control Fitment notes — MOPAR 68309259AD Fits: Trailer Brake ControlCrew Cab Wheelbase 2or Trailer Brake ControlCrew Cab8' Boxor Trailer Brake ControlMega Cabor Trailer Brake ControlRegular Cab8 Foot Bed	View on Amazon
MOPAR Popular Fits: all 2021 2500 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 2or Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesCrew Cab Crew Cab8' Boxor Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesMega Cabor Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black SwitchesRegular Cab8 Foot Bedor Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black Switches or Elec Shift-On-The-Fly Transfer CaseCrew Cab Crew Cab8' Boxor Parksense Front/Rear Park Assist SystemExc. Auto Level Rear Air Suspension or Diesel Exhaust Brake or Black Switches or Elec Shift-On-The-Fly Transfer CaseCrew Cab Wheelbase 2or Parksense Front/Rear Park Assist SystemExc. Auto Level R	View on Amazon
MOPAR Fits: all 2021 2500 engines	68596337AA	🇺🇸 US 🇨🇦 CA	Fits Parksense Front/Rear Park Assist System, Black SwitchesExc. Auto Level Rear Air Suspension or DIESEL Exhaust Brake Fitment notes — MOPAR 68596337AA Fits: Parksense Front/Rear Park Assist System, Black SwitchesExc. Auto Level Rear Air Suspension or DIESEL Exhaust BrakeCrew Cab Wheelbase 2or Parksense Front/Rear Park Assist System, Black SwitchesExc. Auto Level Rear Air Suspension or DIESEL Exhaust BrakeCrew Cab Crew Cab8' Boxor Parksense Front/Rear Park Assist System, Black SwitchesExc. Auto Level Rear Air Suspension or DIESEL Exhaust BrakeMega Cabor Parksense Front/Rear Park Assist System, Black SwitchesExc. Auto Level Rear Air Suspension or DIESEL Exhaust BrakeRegular Cab8 Foot Bed	View on Amazon
MOPAR Fits: all 2021 2500 engines	68309258AB	🇺🇸 US 🇨🇦 CA	Fits Instrument Panel Parts Module Dummy CoverExc. Trailer Brake Control Fitment notes — MOPAR 68309258AB Fits: Instrument Panel Parts Module Dummy CoverExc. Trailer Brake ControlCrew Cab Crew Cab8' Boxor Instrument Panel Parts Module Dummy CoverExc. Trailer Brake ControlCrew Cab Wheelbase 2or Instrument Panel Parts Module Dummy CoverExc. Trailer Brake ControlRegular Cab8 Foot Bedor Instrument Panel Parts Module Dummy CoverExc. Trailer Brake ControlMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 engines	68309259AC	🇺🇸 US 🇨🇦 CA	Fits Trailer Brake ControlCrew Cab Crew Cab Fitment notes — MOPAR 68309259AC Fits: Trailer Brake ControlCrew Cab Crew Cab8' BoxMedium Duty 2WD or: Trailer Brake ControlRegular Cab, 8 Foot BedMedium Duty 2WD or: Trailer Brake ControlMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 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 Cabor 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 Switches 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 Cabor 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' Boxor 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 2or 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 Bed	View on Amazon
MOPAR Fits: all 2021 2500 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 Cabor 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 Switches 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 Cabor 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' Boxor 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 2or 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 Bed	View on Amazon
MOPAR Fits: all 2021 2500 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 2or 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' Boxor Auto Level Rear Air SuspensionExcept Diesel Exhaust Brake or Parksense Front/Rear Park Assist System or Parksense Rear Park Assist System or Black SwitchesMega Cabor 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 Bed	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 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	1R2491	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 Fits: 6.4L V8	987010	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
HOLSTEIN Fits: 6.4L V8	2OPS0409	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: 6.4L V8	PS1000	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Terminal Type: Pins	View on Amazon
MOPAR Fits: 6.4L V8	68334877AA	🇺🇸 US 🇨🇦 CA	Fits MEGA CAB Fitment notes — MOPAR 68334877AA Fits: MEGA CAB or: Regular Cab8 Foot Bedor Crew Cab8' Boxor Crew Cab Wheelbase 2	View on Amazon
WELLS Fits: 6.4L V8	1S16094	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon

Brand	Part Number	Markets	Notes	Buy
WELLS Fits: 6.7L L6 DIESEL Turbocharged	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.

Oxygen (O2) Sensor Relay

Brand	Part Number	Markets	Notes	Buy
HELLA Fits: all 2021 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	V33730152	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Fits 4WDExtended Crew Cab Pickupor Crew Cab Pickup or Standard Cab Pickup	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 2500 engines	RY1627	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	SKPSW174	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front Rightwith 8 Way Power Seat	View on Amazon
DORMAN Fits: all 2021 2500 engines	901477	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front Left8 Way Fitment notes — DORMAN 901477 Front Left8 WayHigh Current	View on Amazon
VEMO Fits: all 2021 2500 engines	V33730104	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Fits Standard Cab Pickupor 4WDExtended Crew Cab Pickupor Crew Cab Pickup Fitment notes — VEMO V33730104 Fits: Standard Cab Pickupor 4WDExtended Crew Cab Pickupor Crew Cab Pickup76.3" bed	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
MOPAR Popular Fits: all 2021 2500 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' BoxDodge E2WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryMega Cabor Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab8 Foot BedDodge E2WD or: Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Wheelbase 2Dodge E2WD	View on Amazon
MOPAR Fits: all 2021 2500 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 Cab or: Front Passenger Seat - Power Adjust 8-WayRegular Cab8 Foot BedDODGE E2WD or: Front Passenger Seat - Power Adjust 8-WayCrew Cab8' BoxDODGE E2WD or: Front Passenger Seat - Power Adjust 8-WayCrew Cab Wheelbase 2Dodge E2WD	View on Amazon
MOPAR Fits: all 2021 2500 engines	56049431AF	🇺🇸 US 🇨🇦 CA	Fits Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryMega Cabor Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals Memory Fitment notes — MOPAR 56049431AF Fits: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryMega Cabor Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Crew Cab8' BoxDodge E2WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab8 Foot BedDodge E2WD or: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2Dodge E2WD	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	PSW126	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Left	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	PSW127	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front Leftwith Memory Seats	View on Amazon

Brand	Part Number	Markets	Notes	Buy
MOPAR Fits: all 2021 2500 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 2or Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryCrew Cab Crew Cab8' Boxor Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryRegular Cab8 Foot Bedor Driver Seat - Power Adjust 8-WayExcept Radio / Driver Seat / Mirrors / Pedals MemoryMega Cab	View on Amazon
MOPAR Fits: all 2021 2500 engines	56049431AG	🇺🇸 US 🇨🇦 CA	Fits Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2or Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals Memory Fitment notes — MOPAR 56049431AG Fits: Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Wheelbase 2or Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryCrew Cab Crew Cab8' Boxor Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryRegular Cab8 Foot Bedor Driver Seat - Power Adjust 8-Way, Radio/Driver Seat/Mirrors/Pedals MemoryMega Cab	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 2500 engines	901873	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front RightCrew Cab Pickup or Extended Crew Cab Pickup	View on Amazon
DORMAN Popular Fits: all 2021 2500 engines	901998	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front LeftCrew Cab Pickup or Extended Crew Cab Pickup Fitment notes — DORMAN 901998 Front LeftCrew Cab Pickup or Extended Crew Cab Pickupwithout Power Folding Mirrors	View on Amazon
ULTRA-POWER Popular Fits: all 2021 2500 engines	DWS1900	🇺🇸 US 🇨🇦 CA	Front Leftwith PWR Folding Mirror Switch Fitment notes — ULTRA-POWER DWS1900 Front Leftwith PWR Folding Mirror Switch2 DRwith Auto Down	View on Amazon
DORMAN Fits: all 2021 2500 engines	920547	🇺🇸 US 🇨🇦 CA	Front RightStandard Cab Pickup	View on Amazon
DORMAN Fits: all 2021 2500 engines	920507	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Fits Rear LeftCrew Cab Pickup or Extended Crew Cab Pickup Fitment notes — DORMAN 920507 Fits: Rear LeftCrew Cab Pickup or Extended Crew Cab Pickup or: Rear RightCrew Cab Pickup or Extended Crew Cab Pickup	View on Amazon
DORMAN Fits: all 2021 2500 engines	920502	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front LeftCrew Cab Pickup or Extended Crew Cab Pickup Fitment notes — DORMAN 920502 Front LeftCrew Cab Pickup or Extended Crew Cab Pickupwith Power Folding Mirrors	View on Amazon
SKP Fits: all 2021 2500 engines	SKDWS1899	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front Left	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Popular Fits: all 2021 2500 engines	DWS1899	🇺🇸 US 🇨🇦 CA	Front LeftStandard Cab Pickup Fitment notes — STANDARD MOTOR PRODUCTS DWS1899 Front LeftStandard Cab Pickupwithout Power Folding Mirrorswith Auto Down	View on Amazon
ROSTRA Fits: all 2021 2500 engines	661072	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Rear	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1649	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Rear	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1989	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Connector Shape: Square Fitment notes — STANDARD MOTOR PRODUCTS DWS1989 Connector Shape: Square Front Right	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS1900	🇺🇸 US 🇨🇦 CA	Front LeftStandard Cab Pickup Fitment notes — STANDARD MOTOR PRODUCTS DWS1900 Front LeftStandard Cab Pickupwith Power Folding Mirrorswith Auto Down	View on Amazon
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	DWS2266	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Includes Bezel Fitment notes — STANDARD MOTOR PRODUCTS DWS2266 Includes Bezel Front LeftCrew Cab Pickup or Extended Crew Cab Pickup	View on Amazon
WELLS Fits: all 2021 2500 engines	1S15428	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front Right	View on Amazon
WELLS Fits: all 2021 2500 engines	1S14264	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Fits Rear Right Fitment notes — WELLS 1S14264 Fits: Rear Right or: Rear Left	View on Amazon
WELLS Fits: all 2021 2500 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 2500 engines	1S15525	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	Front LeftCrew Cab Pickup Fitment notes — WELLS 1S15525 Front LeftCrew Cab Pickupwith Power Folding Mirrors	View on Amazon
WELLS Fits: all 2021 2500 engines	1S14234	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	CY1322699	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	933332641	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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
MOPAR Fits: all 2021 2500 engines	68413389AC	🇺🇸 US 🇨🇦 CA	Trailer Tow Module Fitment notes — MOPAR 68413389AC Trailer Tow Module Fits: Trailer Brake ControlCrew Cab Wheelbase 2or Trailer Brake ControlCrew Cab8' Boxor Trailer Brake ControlMega Cabor Trailer Brake ControlRegular Cab8 Foot Bed	View on Amazon
SKP Fits: all 2021 2500 engines	SKS390	🇺🇸 US 🇨🇦 CA 🇲🇽 MX	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 2500 engines	SBA2005	🇺🇸 US 🇨🇦 CA	Automatic Transmission Oil Pressure Switch	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 Pickup6 speed trans.or Crew Cab Pickup or Standard Cab Pickup6 speed trans.	View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
WELLS Fits: all 2021 2500 engines	1S16124	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	901279	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
VEMO Fits: all 2021 2500 engines	V33730073	🇺🇸 US 🇨🇦 CA		View on Amazon

Standard Replacement

Brand	Part Number	Markets	Notes	Buy
STANDARD MOTOR PRODUCTS Fits: all 2021 2500 engines	CBS1925	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
WELLS Fits: all 2021 2500 engines	1S11313	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500 engines	CBS1925	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		View on Amazon
WELLS Fits: all 2021 2500 engines	1S11313	🇺🇸 US 🇨🇦 CA 🇲🇽 MX		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 2500

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 2500?

Our catalog currently lists 107 electrical switch & relay parts for the 2021 Ram 2500 across 31 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 2500 engines?

Some do. 100 parts fit every engine; the other 7 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 2500?

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 2500 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 2500?

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 2500

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 2500 Years

2026 Ram 2500 2025 Ram 2500 2024 Ram 2500 2023 Ram 2500 2022 Ram 2500 2020 Ram 2500 2019 Ram 2500 2018 Ram 2500 2017 Ram 2500 2016 Ram 2500 2015 Ram 2500 2014 Ram 2500

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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