2015 Ram 3500 Fuse Box Diagram & Amperage
Your comprehensive guide to the fuse box locations, diagrams, and amperage ratings for the 2015 Ram 3500.
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Quick answer
Your 2015 Ram 3500 has three main fuse box locations:
- Under-hood: Located in the engine compartment, typically near the battery on the driver's side. This is the main Power Distribution Center (PDC).
- Instrument Panel (Dash): Found behind a cover on the driver's side of the dashboard, often near the kick panel.
- Rear (Cargo/Trunk Area): Located behind a trim panel in the rear cargo area or under the rear seat, depending on your cab configuration.
Under-hood Power Distribution Center (PDC)
This fuse box contains most of the higher amperage fuses and relays for critical engine functions, lights, and other heavy-duty systems.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F01 | 20A | Yellow | Headlights (Low Beam, Left) |
| F02 | 20A | Yellow | Headlights (Low Beam, Right) |
| F03 | 15A | Blue | Horn |
| F04 | 20A | Yellow | Blower Motor |
| F05 | 15A | Blue | Ignition Switch |
| F06 | 10A | Red | ECM/PCM (Powertrain Control Module) |
| F07 | 20A | Yellow | Fuel Pump Relay |
| F08 | 30A | Green | ABS (Anti-lock Brake System) Pump |
| F09 | 15A | Blue | ABS (Anti-lock Brake System) Valves |
| F10 | 20A | Yellow | Wiper Motor (Front) |
| F11 | 10A | Red | A/C Clutch |
| F12 | 25A | Clear | Trailer Brake Controller (OEM/Integrated) |
| F13 | 30A | Green | Starter Solenoid |
| F14 | 40A | Green | Main Cabin Fuse / Interior Power Distribution |
| F15 | 20A | Yellow | Headlights (High Beam, Left) |
| F16 | 20A | Yellow | Headlights (High Beam, Right) |
| F17 | 15A | Blue | Tail Lights / Parking Lights (Left) |
| F18 | 15A | Blue | Tail Lights / Parking Lights (Right) |
| F19 | 20A | Yellow | Auxiliary Power Outlet (Under-hood) |
| F20 | 10A | Red | Transmission Control Module (TCM) |
| F21 | 20A | Yellow | Heated Mirrors (If Equipped) |
| F22 | 10A | Red | O2 Sensors / Emissions |
| F23 | 20A | Yellow | Fog Lights (If Equipped) |
| F24 | 15A | Blue | Interior Lights / Dome Lights |
| F25 | 10A | Red | Radio / Infotainment System (Main) |
| F26 | 30A | Green | Power Windows |
| F27 | 30A | Green | Power Seats (If Equipped) |
| F28 | 10A | Red | Powertrain Control Module (PCM - Additional) |
| F29 | 20A | Yellow | Power Inverter (If equipped) |
| F30 | 20A Yellow | Upfitter Switches (If equipped) |
Common Relays in the Under-hood PDC:
- R1: Fuel Pump Relay
- R2: Starter Relay
- R3: Horn Relay
- R4: HVAC Blower Motor Relay
- R5: Headlight Low Beam Relay
- R6: Headlight High Beam Relay
- R7: A/C Clutch Relay
- R8: Run/Accessory Relay
- R9: Trailer Tow Left Stop/Turn Relay
- R10: Trailer Tow Right Stop/Turn Relay
- R11: Trailer Tow Park Lamp Relay
Note: Fuse and relay locations may vary slightly based on specific trim levels and optional equipment. Always refer to your vehicle's owner's manual and the diagram on the inside of the PDC cover for the most accurate information.
Instrument Panel Fuse Box (Dash Kick-Panel)
This fuse box primarily handles interior electrical components, accessories, and some control module power supplies.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| M01 | 10A | Red | Radio / Infotainment (Memory/Constant Power) |
| M02 | 10A | Red | Airbag Control Module (SRS) |
| M03 | 15A | Blue | Cigar Lighter / 12V Power Outlet (Dash) |
| M04 | 20A | Yellow | Power Outlet (Console/Auxiliary) |
| M05 | 10A | Red | Instrument Cluster / Gauges |
| M06 | 15A | Blue | Wipers (Rear, if equipped) |
| M07 | 10A | Red | HVAC Control Head |
| M08 | 10A | Red | Occupant Detection System |
| M09 | 15A | Blue | Power Door Locks |
| M10 | 10A | Red | Compass / Temperature Sensor |
| M11 | 10A | Red | Electronic Stability Control (ESC) |
| M12 | 10A | Red | Driver Information Display (DID) |
| M13 | 10A Red | Mirror Switch / Heated Mirror Control | |
| M14 | 15A | Blue | USB Ports / Media Hub |
| M15 | 10A | Red | Steering Wheel Controls |
| M16 | 10A | Red | Passive Entry / Keyless Go |
| M17 | 10A | Red | Trailer Brake Module (Interface) |
| M18 | 10A | Red | Data Link Connector (DLC) |
| M19 | 20A | Yellow | Heated Steering Wheel (If Equipped) |
| M20 | 20A | Yellow | Heated Seats (If Equipped) |
Note: Fuse numbering for the instrument panel fuse box often starts with 'M' (Mini) or 'J' (Junction Block) on Ram vehicles. Always verify with the fuse box lid diagram and your owner's manual.
Rear Fuse Box (Cargo/Under-Seat Area)
This fuse box typically handles power for rear specific accessories, power outlets, and other systems located in the rear of the truck.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| R01 | 20A | Yellow | Power Outlet (Rear) |
| R02 | 15A | Blue | Rear Window Defroster (If Equipped) |
| R03 | 10A | Red | Rear Audio Amplifiers (If Equipped) |
| R04 | 10A | Red | Power Sliding Rear Window (If Equipped) |
| R05 | 10A | Red | Reverse Lights / Backup Camera (If Equipped) |
| R06 | 15A | Blue | Trailer Tow (Marker Lights) |
| R07 | 15A | Blue | Trailer Tow (Stop/Turn Lights, Right) |
| R08 | 15A | Blue | Trailer Tow (Stop/Turn Lights, Left) |
| R09 | 20A | Yellow | Cargo Area Light |
| R10 | 10A | Red | Tailgate Release (If Equipped) |
| R11 | 20A | Yellow | Power Inverter (Rear Outlets, If Equipped) |
| R12 | 15A | Blue | Bed Lighting (If Equipped) |
Note: Specific locations and fuse assignments can vary by cab style and options. Always cross-reference with your owner's manual and the diagram on the fuse box cover.
How to Test a Fuse
Testing a fuse is a straightforward process that can save you time and money by avoiding unnecessary trips to the mechanic. Here's a simple guide:
- Safety First: Ensure the vehicle's ignition is off and disconnect the negative terminal of the battery if you are working near vital engine components.
- Locate the Fuse Box: Refer to the
Before you pull a fuse on the 2015 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 2015 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
2015 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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