The fifrth-generation Dodge Ram Heavy Duty, produced in 2019, 2020, 2021, 2022, 2023, 2024, 2025 and 2026 also known as the Ram HD. In this post you can find a description of fuses and relays RAM 2500 3500 5G with fuse box diagrams, their locations and photo examples of performance. We also highlight the fuse responsible for the cigarette lighter.
The purpose of some elements in the diagrams may differ from the one presented and depends on the year of manufacture, configuration and country of delivery. In case of difficulty, contact your nearest dealer.
Main Fuse Box
Fuse and Relay box is located in the engine compartment near the battery.
Photo for example
Check the purpose of the elements with your diagram on the back of the block cover.
Diagram
Assignment
| F01 | 60A — Glow Plug Module |
| F02 | 60A — ABS Pump Motor |
| F03 | 60A — Radiator Fan HI / LO |
| F04 | 50A — 400W Inverter |
| F05 | 40A / 50A — Air Suspension Compressor |
| F06 | 40A — Steering Torque Overlay Module (STOM) |
| F07 | 40A — Starter Solenoid |
| F08 | 20A — NOX Sensor |
| F09 | 30A / 40A — Brake Vacuum Pump / Diesel Fuel Heater |
| F10 | 40A / 50A — BCM Feed #2 / Exterior Lights #2 |
| F11 | 40A — Brake System Module ECU & Valves |
| F12 | 40A — BCM Feed #3 / Power Locks / Exterior Lights |
| F13 | 40A — HVAC Blower Motor |
| F14 | 40A — BCM Feed #4 / Exterior Lights / Power Locks |
| F15 | 30A / 50A — Power Side Steps / BCM Feed #1 |
| F16 | 30A — Smart-Bar Module |
| F17 | 30A — Winch Control Module |
| F18 | 20A — Smart Motor Passenger Rear |
| F19 | 30A — Diesel SCR Feed |
| F20 | 30A — Passenger Door Module |
| F21 | 30A — Drive Train Control Module |
| F22 | 20A / 25A — ECM / PCM |
| F23 | 30A — BCM Feed #1 / Interior Light |
| F24 | 30A — Driver Door Module |
| F25 | 30A — Front Wiper |
| F26 | Spare |
| F27 | 25A — ITCM #1 Lights |
| F28 | 20A — Trailer Tow Backup Lights |
| F29 | 20A — Trailer Tow Parking Lights |
| F30 | 30A — Trailer Tow |
| F31 | 30A — Driver Seat Switch / Power Seat |
| F32 | 25A — ITCM #2 Lights |
| F33 | 20A — Transmission Control Module |
| F34 | 30A / 20A — VSIM #2 / Smart Motor Driver Rear |
| F35 | 30A — Sunroof |
| F36 | 30A — Rear Defroster |
| F37 | 30A / 20A — Fuel Heater / NOX Sensor |
| F38 | 30A — Trailer Brake Module / E-Brake |
| F39 | 30A — Passenger Power Seat |
| F40 | 10A — Ventilated Seats |
| F41 | 10A — Active Grille Shutter / Air Dam |
| F42 | 20A — Horn |
| F43 | 15A — Heated Steering Wheel |
| F44 | 10A — Diagnostic Port |
| F45 | Spare |
| F46 | 10A — Upfitters Relay Coils |
| F47 | Spare |
| F48 | Spare |
| F49 | 10A / 15A — Instrument Cluster / CVADAS |
| F50 | 20A — Air Suspension Control Module |
| F51 | 10A — Ignition Node / RF Hub / Steering Lock |
| F52 | 5A — Battery Sensor |
| F53 | 20A — Trailer Tow Left Turn / Stop Lights |
| F54 | 20A — Adjustable Pedals |
| F55 | 10A — Forward Utility Lamps |
| F56 | 10A — Fuel Vapor Blocker Valve |
| F57 | 20A — TCM / PCM / Tailgate Latches |
| F58 | 10A — Bed Lighting |
| F59 | 10A — ORC Module |
| F60 | Spare |
| F61 | 10A — NH3 / PM Sensor |
| F62 | 10A — A/C Clutch |
| F63 | 20A — Ignition Coils / CAPS |
| F64 | 25A — Fuel Injectors / PCM |
| F65 | 10A — Inverter / USB / BLE Module |
| F66 | 10A — Sunroof / USB Rear / Rain Sensor |
| F67 | 10A — UCI / Trailer 360 Camera |
| F68 | 10A — AEB RACAM Heater |
| F69 | 15A — SCR Module 12V |
| F70 | 30A — Fuel Pump Motor |
| F71 | 25A / 20A — Amplifier / SLM RT |
| F72 | Spare |
| F73 | 20A — Fuel Transfer Pump |
| F74 | 10A — Backup Alarm |
| F75 | 10A — ATMM / SCR Relay |
| F76 | 10A — Electronic Stability Control |
| F77 | 10A — Drivetrain / Front Axle / TCM / STOM |
| F78 | 15A — ECM / PCM / AEB / HRLS |
| F79 | 15A — ID / Clearance Lights |
| F80 | 10A — Overhead Console / SOS / Assist |
| F81 | 20A — Trailer Tow Right Turn / Stop Lights |
| F82 | 10A — Steering Column / Cruise Control |
| F83 | 10A — Trailer Assist / Reverse Control |
| F84 | 15A — HVAC / Heated Seat Switches |
| F85 | 10A / 15A — Airbag Module / CADM |
| F86 | 10A — Airbag Module |
| F87 | 10A — Air Suspension / ITBM / Steering Module |
| F88 | 15A — Instrument Panel Cluster |
| F89 | Spare |
| F90 | 20A — Power Outlet Battery |
| F91 | Power Outlet ACC |
| F92 | 10A — Inverter Module / USB |
| F93 | 20A / 10A — Cigar Lighter / UREA Sensor |
| F94 | 10A — Shift-By-Wire / Transfer Case |
| F95 | 10A — Rear Camera / Park Assist / Blind Spot |
| F96 | 10A — Trailer Camera |
| F97 | 20A — Front Heated Seat Passenger |
| F98 | 20A — Front Heated Seat Driver |
| F99 | 10A — HVAC / Cabin Temp Sensor |
| F100 | 10A — Upfitter Box Feed |
| F101 | 20A — Rear Heated Seat Right |
| F102 | 20A — Rear Heated Seat Left |
| F103 | 10A — Headlamp AFLS |
| F104 | 20A — USB Rear / UCI Port |
The operation of the cigarette lighter is controlled by fuses number 39 and 90.
Auxiliary Power Fuse Box
The Aux related fuses and relay locations are shown below. Additional relays and fuses located in the Aux PDC that are not related to Auxiliary functions are grayed out/not shown. These NON-Auxiliary fuses and relays are not to bemanipulated or relocated.
Photo
Diagram
Designation
| RUN ONLY 20A | Ignition/Run-only power fuse. Receives power only when the vehicle ignition is in the RUN position. |
| AUX 6 / PTO 40A | Auxiliary Circuit 6 / Power Take-Off fuse. Used for PTO systems or heavy external equipment. |
| AUX 5 20A | Auxiliary Circuit 5 fuse for optional aftermarket electrical accessories. |
| AUX 3 40A | High-current Auxiliary Circuit 3 fuse for additional powered equipment. |
| AUX 4 25A | Medium-current Auxiliary Circuit 4 fuse for auxiliary accessories or custom body equipment. |
| AUX 2 40A | High-current Auxiliary Circuit 2 fuse intended for external add-on systems. |
| AUX 1 40A | High-current Auxiliary Circuit 1 fuse for auxiliary electrical devices and upfitter equipment. |
| RUN RELAY | Relay that supplies switched ignition power when the vehicle is running. |
| AUX 6 / PTO RELAY | Relay controlling Auxiliary Circuit 6 / PTO electrical output. |
| AUX 5 RELAY | Relay controlling Auxiliary Circuit 5 accessory power. |
| AUX 4 RELAY | Relay controlling Auxiliary Circuit 4 accessory power. |
| AUX 1 RELAY | Relay controlling Auxiliary Circuit 1 accessory power. |
| AUX 3 RELAY | Relay controlling Auxiliary Circuit 3 accessory power. |
| AUX 2 RELAY | Relay controlling Auxiliary Circuit 2 accessory power. |
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