2020 Ram 3500 Fuse Box Diagram & Amperage
Find every fuse box location and get a detailed breakdown of the fuse and relay assignments for your 2020 Ram 3500.
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Quick answer
The 2020 Ram 3500 has two primary fuse box locations:
- Under-Hood Power Distribution Center: Located in the engine bay on the driver's side, near the battery.
- Interior Fuse Box: Located under the dashboard on the driver's side, to the left of the steering column, often accessible by removing a trim panel or opening a small door.
Under-Hood Power Distribution Center
This is the main fuse box, housing high-amperage fuses and relays for critical engine and vehicle systems. The layout can vary slightly based on your truck's powertrain (e.g., Cummins Turbo Diesel vs. Gas HEMI) and options. Always check the diagram on the underside of the fuse box lid to confirm fuse locations.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F03 | 40A | Green | ABS Pump |
| F05 | 40A | Green | Trailer Tow Backup Lights Relay |
| F06 | 30A | Pink | Starter Solenoid |
| F10 | 40A | Green | Blower Motor (Front) |
| F14 | 30A | Pink | Ignition Coils / Powertrain Control Module (PCM) |
| F16 | 30A | Pink | Trailer Tow Parking Lights |
| F22 | 25A | Natural | A/C Clutch |
| F24 | 20A | Yellow | Fuel Pump Motor |
| F30 | 30A | Pink | Trailer Brake Controller |
| F31 | 25A | Natural | Left Low-Beam Headlight |
| F32 | 25A | Natural | Right Low-Beam Headlight |
| F33 | 15A | Blue | Left High-Beam Headlight |
| F34 | 15A | Blue | Right High-Beam Headlight |
| F42 | 20A | Yellow | ECM / PCM |
| F60 | 20A | Yellow | Cigarette Lighter / 12V Power Outlet |
| F71 | 30A | Pink | Airbag / Occupant Restraint Controller (ORC) |
| F76 | 15A | Blue | Tail / Park Lamps |
| F80 | 20A | Yellow | Horn |
| F88 | 15A | Blue | Brake Lamps (CHMSL) |
Common Relays in this Location:
- Starter Relay
- Fuel Pump Relay
- A/C Clutch Relay
- Blower Motor Relay
- Headlight Relays
- Trailer Tow Relays
Interior Fuse Box
This fuse panel, often called the Body Control Module (BCM), handles most of the fuses for cabin accessories and interior functions. It is located under the driver's side dashboard.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F38 | 10A | Red | Airbag / Occupant Restraint Controller (ORC) |
| F46 | 10A | Red | Instrument Panel Cluster |
| F47 | 20A | Yellow | Radio / Infotainment System (Uconnect) |
| F48 | 10A | Red | HVAC Control Module |
| F65 | 20A | Yellow | Adjustable Pedals |
| F90 | 10A | Red | Ignition Switch |
| F91 | 10A | Red | Steering Column Control Module |
| F97 | 20A | Yellow | 12V Power Outlet (Console) |
| F99 | 10A | Red | OBD-II Diagnostic Port Power |
Note on Variation: The fuse numbers and circuits listed above are for the most common configuration. Your 2020 Ram 3500's specific layout may differ based on trim level (Tradesman, Big Horn, Laramie, Limited) and optional equipment. It is essential to verify fuse locations and amperage with the diagram printed inside your fuse box covers.
How to test a fuse
A blown fuse is a common and easy-to-fix issue. You can visually inspect most "blade" type fuses.
- Turn the vehicle off.
- Locate and remove the fuse box cover.
- Using a fuse puller (often included on the fuse box cover) or a pair of needle-nose pliers, carefully pull the suspect fuse straight out of its slot.
- Hold the fuse up to the light. Inside the plastic body, you will see a small metal strip. If this strip is broken or melted, the fuse is blown.
- If you can't see clearly, use a multimeter set to continuity mode. Touch the probes to each blade of the fuse. A good fuse will cause the multimeter to beep; a blown one will not.
- Always replace a blown fuse with a new one of the exact same amperage rating. Using a higher-rated fuse can cause severe damage to the electrical circuit and create a fire hazard.
Common blown fuses on this vehicle
- Cigarette Lighter / 12V Power Outlet Fuse (F60 or F97): This is one of the most frequently blown fuses. It often happens when a faulty phone charger or other accessory is plugged in. If the fuse blows, first check the device you plugged in. Look for debris inside the 12V outlet itself that could be causing a short circuit.
- Trailer Tow Fuses (F05, F16, F30): Problems with trailer wiring are a common cause for blown fuses on heavy-duty trucks. If your trailer lights or brakes aren't working and a fuse is blown, the issue is most likely with the trailer's wiring harness, not the truck. Inspect the trailer plug and wiring for corrosion, frayed wires, or shorts before replacing the fuse.
- Fuel Pump Fuse (F24): While less common, a blown fuel pump fuse will prevent the truck from starting. If you replace it and it blows again immediately, it could indicate a failing fuel pump or a short in the wiring to the pump that requires professional diagnosis.
Find a trusted shop on Repairius.
Before you pull a fuse on the 2020 Ram 3500
- 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 3500
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 3500 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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