2015 Chevrolet Silverado 3500HD Fuse Box Diagram & Amperage
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Quick answer
The 2015 Chevrolet Silverado 3500HD has three main fuse box locations: under the hood (engine compartment), inside the cabin on the driver's side kick panel, and a third fuse block located under the rear seat on the driver's side.
Under-hood Fuse Box (Engine Compartment Fuse Block)
This fuse box is located in the engine compartment on the driver's side, near the battery. It contains fuses and relays for critical engine functions, lighting, and other high-current accessories. Always consult the diagram on the fuse box lid for the most accurate information for your specific trim level.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 25A | Clear | Fuel Pump / Fuel Pump Control Module |
| F2 | 10A | Red | ECM/PCM (Engine Control Module/Powertrain Control Module) |
| F3 | 15A | Blue | Ignition Coils / Powertrain Relay Solenoid |
| F4 | 20A | Yellow | Starter Solenoid |
| F5 | 10A | Red | Headlamp Low Beam (Left) |
| F6 | 10A | Red | Headlamp Low Beam (Right) |
| F7 | 15A | Blue | Headlamp High Beam (Left) |
| F8 | 15A | Blue | Headlamp High Beam (Right) |
| F9 | 10A | Red | Tail Lamps / Park Lamps (Left) |
| F10 | 10A | Red | Tail Lamps / Park Lamps (Right) |
| F11 | 20A | Yellow | ABS Module (Anti-lock Brake System) |
| F12 | 25A | Clear | Trailer Brake Control Module |
| F13 | 30A | Green | Blower Motor (Front) |
| F14 | 10A | Red | A/C Clutch Relay |
| F15 | 20A | Yellow | ECM/PCM Main Power |
| F16 | 15A | Blue | Horn Relay |
| F17 | 30A | Green | Wiper Motor |
| F18 | 20A | Yellow | Transfer Case Control Module (4WD models) |
| F19 | 10A | Red | O2 Sensors |
| F20 | 15A | Blue | Injectors |
| F21 | 10A | Red | Brake Pedal Position Sensor |
| F22 | 15A | Blue | Transmission Control Module (TCM) |
Relays in the Under-hood Fuse Box:
- RUN/CRANK Relay: Powers various circuits during ignition on and cranking.
- Fuel Pump Relay: Controls power to the fuel pump.
- Starter Relay: Engages the starter motor.
- Headlamp Relays (Low/High Beam): Control power to the headlamps.
- Horn Relay: Activates the horn.
- A/C Clutch Relay: Engages the A/C compressor clutch.
- Trailer Brake Relay: Provides power to the trailer brake system.
Instrument Panel Fuse Box (Driver's Side Kick Panel)
This fuse box is located on the driver's side of the dashboard, behind a removable panel on the kick panel. It houses fuses for various interior electrical components, accessories, and some control modules. Always refer to the diagram on the back of the fuse panel cover for the specific layout for your truck.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 15A | Blue | Radio / Infotainment System |
| F2 | 20A | Yellow | Cigar Lighter / 12V Power Outlet (Front) |
| F3 | 10A | Red | HVAC Control Module (Heating, Ventilation, Air Conditioning) |
| F4 | 10A | Red | Instrument Cluster |
| F5 | 15A | Blue | Airbag (Supplemental Inflatable Restraint) Module |
| F6 | 10A | Red | Body Control Module (BCM) - various functions |
| F7 | 5A | Tan | Interior Lamps / Dome Lamp |
| F8 | 20A | Yellow | Power Windows (Driver) |
| F9 | 20A | Yellow | Power Windows (Passenger) |
| F10 | 25A | Clear | Power Door Locks |
| F11 | 10A | Red | Heated Seats (Driver) |
| F12 | 10A | Red | Heated Seats (Passenger) |
| F13 | 15A | Blue | USB Ports / Auxiliary Power Outlet |
| F14 | 5A | Tan | Steering Wheel Controls |
| F15 | 15A | Blue | Wiper Delay |
| F16 | 10A | Red | OnStar System |
| F17 | 15A | Blue | Power Mirrors |
| F18 | 5A | Tan | HVAC Blower Control |
| F19 | 10A | Red | Brake Light Switch (for cruise control/trailer brake) |
| F20 | 15A | Blue | Rear Defogger Relay |
Rear Under-seat Fuse Box (Driver's Side)
Located on the driver's side, under the rear seat, this fuse box handles circuits primarily related to rear-of-vehicle accessories, trailer functions, and some heavy-duty systems specific to the Silverado 3500HD. Lift the rear driver's side seat to access this fuse block.
| Fuse # | Amp | Color | Circuit / Component Protected |
|---|---|---|---|
| F1 | 30A | Green | Trailer A/C Power (Constant) |
| F2 | 20A | Yellow | Trailer Battery Charging |
| F3 | 15A | Blue | Trailer Stop/Turn Lamps (Left) |
| F4 | 15A | Blue | Trailer Stop/Turn Lamps (Right) |
| F5 | 10A | Red | Trailer Marker Lamps |
| F6 | 30A | Green | Rear HVAC Blower Motor (Crew Cab models with rear HVAC) |
| F7 | 25A | Clear | Bed Lighting / Cargo Lamp |
| F8 | 10A | Red | Rear Power Outlet / USB Ports (rear) |
| F9 | 15A | Blue | Auxiliary Trailer Brake Controller Interface |
| F10 | 20A | Yellow | Upfitter Switches (if equipped) |
How to test a fuse
Testing a fuse is a straightforward process. You'll need a fuse puller (usually found in one of the fuse boxes) and a multimeter or a dedicated fuse tester.
- Locate the suspected fuse: Refer to the fuse box diagram to identify the fuse for the circuit that's not working.
- Turn off the ignition: Ensure the vehicle's ignition is off to prevent electrical shorts or injury.
- Remove the fuse: Use the fuse puller to carefully extract the fuse from its slot. Inspect it visually; a blown fuse will often have a broken wire or a melted appearance inside.
- Test with a multimeter (Ohm setting): Touch the probes of the multimeter to the two metal prongs on top of the fuse. If the multimeter reads near zero ohms (or beeps for continuity), the fuse is good. If it reads
Before you pull a fuse on the 2015 Chevrolet Silverado 3500HD
- 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 Chevrolet Silverado 3500HD
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
2014 Silverado 3500HD
2016 Silverado 3500HD
2017 Silverado 3500HD
2018 Silverado 3500HD
2019 Silverado 3500HD
2020 Silverado 3500HD
Maintenance & repair guides
2015 Chevrolet Silverado 3500HD 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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