2020 Ram 2500 Fuse Box Diagram
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Quick Answer
Your 2020 Ram 2500 has three main fuse box locations:
- Under-Hood Power Distribution Center: Located in the engine bay, near the battery on the driver's side.
- Interior Fuse Box: Located under the driver's side dashboard, near the steering column.
- Rear Fuse Box/Power Distribution Center: Located in the truck bed on the driver's side, integrated into the RamBox Cargo Management System (if equipped).
Under-Hood Power Distribution Center
This is the main fuse box, housing high-amperage fuses and relays for major vehicle systems. To access it, open the hood and locate the black plastic box near the battery. Press the tabs on the lid to remove it. You'll find a diagram of the fuse and relay layout on the underside of the lid.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F03 | 60A | Yellow | Trailer Tow Backup Lights Relay |
| F05 | 40A | Green | Anti-Lock Brake System (ABS) Pump/ESP |
| F06 | 30A | Pink | Anti-Lock Brake System (ABS) Valve/ESP |
| F07 | 40A | Green | Starter Motor Solenoid |
| F10 | 40A | Green | Blower Motor (Front) |
| F14 | 25A | Natural | Powertrain Control Module (PCM) |
| F21 | 20A | Blue | Fuel Pump Motor |
| F24 | 20A | Blue | Ignition Coils (Gas) / NOx Sensor (Diesel) |
| F30 | 25A | Natural | Trailer Tow Park Lights |
| F31 | 30A | Pink | Trailer Tow Electric Brakes |
| F38 | 20A | Blue | Horn |
| F42 | 15A | Light Blue | Left Low Beam Headlamp |
| F43 | 15A | Light Blue | Right Low Beam Headlamp |
| F44 | 15A | Light Blue | Left High Beam Headlamp |
| F45 | 15A | Light Blue | Right High Beam Headlamp |
| F50 | 25A | Natural | A/C Clutch |
| F51 | 30A | Pink | Windshield Wiper Motor |
| F70 | 20A | Blue | 115V AC Power Inverter |
| F71 | 25A | Natural | Cigar Lighter / 12V Power Outlet (Instrument Panel) |
| F72 | 25A | Natural | Cigar Lighter / 12V Power Outlet (Center Console) |
Relay Locations (Under-Hood)
- Starter Relay: Controls power to the starter motor.
- Fuel Pump Relay: Activates the fuel pump.
- A/C Clutch Relay: Engages the air conditioning compressor.
- Blower Motor Relay: Controls the HVAC blower fan.
- Ignition Relay: Part of the main ignition power circuit.
Interior Fuse Box
This fuse panel is located under the dashboard on the driver's side, often behind a small access door or trim panel. It primarily protects interior circuits and components.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F17 | 10A | Red | Airbag Module (OCS) |
| F23 | 10A | Red | Steering Column Control Module |
| F32 | 10A | Red | Radio / Infotainment System (Uconnect) |
| F34 | 15A | Light Blue | Instrument Panel Cluster |
| F48 | 10A | Red | Parking Brake Switch |
| F52 | 10A | Red | Stop Lamp Switch (Brake Lights) |
| F60 | 20A | Blue | Sunroof |
| F65 | 10A | Red | HVAC Control Module |
| F88 | 15A | Light Blue | OBD-II Diagnostic Port Power |
| F90/F91 | 15A | Light Blue | Left/Right Tail, Park, and License Plate Lamps |
| F97 | 20A | Blue | Air Suspension Control Module (if equipped) |
Note: Fuse numbers and assignments can vary based on your truck's specific trim level and options (e.g., Laramie, Power Wagon, Cummins diesel vs. Hemi gas). Always confirm the fuse layout with the diagram printed inside your fuse box cover.
How to Test a Fuse
A blown fuse is a common and easy-to-fix issue. You can visually inspect a fuse to see if it's blown.
- Safety First: Turn off the ignition and all accessories.
- Locate the Fuse: Find the suspect fuse using the diagram.
- Remove the Fuse: Use the fuse puller tool often found in the fuse box, or a pair of needle-nose pliers, to gently pull the fuse straight out.
- Inspect: Hold the fuse up to the light. Inside a good fuse, you will see an intact, S-shaped metal filament. In a blown fuse, this filament will be broken or melted.
- Replace: If blown, replace it with a new fuse of the exact same amperage rating. Using a higher-rated fuse can cause a fire. The amp rating is printed on top of the fuse and is color-coded.
Common Blown Fuses on the 2020 Ram 2500
- Cigar Lighter / 12V Power Outlet Fuse (F71/F72): This is one of the most common fuses to blow, often due to a faulty phone charger or other plugged-in device. If this fuse blows, first check the device you were using for damage. Also, check the socket for any foreign objects like a coin that may have fallen inside and caused a short.
- Trailer Tow Fuses (F30/F31): Issues with trailer wiring are a frequent cause. If your trailer lights or brakes aren't working, check these fuses first. The problem is often a short in the trailer's wiring harness or a corroded connector. Inspect the 7-pin connector on both the truck and the trailer.
- Fuel Pump Fuse (F21): While less common, if your truck cranks but won't start, this fuse is a good first check. A blown fuse here could indicate a failing fuel pump that is drawing too much current.
If a fuse blows repeatedly, it signals an underlying electrical problem that needs to be diagnosed. Avoid simply installing a larger fuse, as this creates a serious fire hazard.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2020 Ram 2500
- Use the label printed on the panel cover or the owner's manual for your exact build. Layouts change with options, model year and build date, so a chart for another truck can be wrong.
- Replace a blown fuse only with the same amp rating. A larger fuse can let wiring overheat.
- A fuse that blows again right away means a short or failing component downstream. Find the cause before replacing it again.
- A good fuse doesn't prove the circuit works — relays, grounds and connectors fail too.
- Disconnect the battery before working near high-current fuses or cables.
Learn more: How fuses, relays and truck electrical systems work
More specs for the 2020 Ram 2500
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2020 Ram 2500 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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