2015 Chevrolet Silverado 2500HD – Fuse Box Diagram & Amperage

Quick Answer

The 2015 Chevrolet Silverado 2500HD has three main fuse box locations:

• Underhood Fuse Block: Located in the engine compartment, on the driver's side, near the battery.
• Instrument Panel Fuse Block: Found on the driver's side, under the dashboard, behind a removable trim panel.
• Rear Underseat Fuse Block: Located under the rear seat, typically on the driver's side.

Underhood Fuse Block

This fuse block is located in the engine compartment on the driver's side of the vehicle. 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 exact layout for your specific trim level.

Relay Locations (Underhood):

• RL1: Fuel Pump Relay
• RL2: Starter Relay
• RL3: Headlight Low Beam Relay
• RL4: Headlight High Beam Relay
• RL5: Blower Motor Relay
• RL6: A/C Clutch Relay
• RL7: Horn Relay

Instrument Panel Fuse Block

This fuse block is located on the driver's side of the dashboard, behind a removable access panel. It typically houses fuses for interior accessories, radio, power outlets, and other cabin electronics. Remove the trim panel carefully to access the fuses.

Rear Underseat Fuse Block

This fuse block is located under the rear seat of the truck, usually on the driver's side. It often contains fuses for rear accessories, power outlets, and certain trailer functions. Lift the rear seat bottom to access this fuse block.

How to Test a Fuse

1. Safety First: Ensure the vehicle is off and the ignition key is removed before testing or replacing any fuses.
2. Locate the Fuse: Refer to the fuse box diagrams above and the legend on your fuse box lid to find the suspected fuse.
3. Visual Inspection: Many modern fuses have a visible wire inside. If this wire is broken or melted, the fuse is blown. You may also see a discolored or burnt appearance.
4. Use a Multimeter (Recommended):
   • Set your multimeter to the continuity or ohms setting.
   • Touch one probe to each metal test point on the top of the fuse (without removing it). If it's difficult to get to the test points, you can remove the fuse.
   • A good fuse will show a reading of continuity (usually a "0" or a very low ohm reading) and/or the multimeter will beep. A blown fuse will show an open circuit (OL or infinity).
5. Use a Test Light:
   • Connect the alligator clip of the test light to a known good ground point on the vehicle.
   • With the ignition on (but engine off), touch the probe of the test light to each metal test point on the top of the fuse (again, without removing it if possible).
   • If the test light illuminates on both sides of the fuse, the fuse is good. If it only illuminates on one side or not at all, the fuse is blown.
6. Replace Cautiously: If a fuse is blown, replace it with a new fuse of the exact same amperage rating and physical size. Never use a fuse with a higher amperage rating, as this can lead to severe electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow, some are more commonly affected due to their function or the components they protect. On the 2015 Chevrolet Silverado 2500HD, you might frequently encounter issues with:

• Cigarette Lighter / Power Outlet Fuses (Instrument Panel F3, F4, Rear F1): These are often blown by plugging in faulty accessories, overloading the circuit with high-power devices, or short circuits in the connected devices. What to check first: Disconnect all devices from the outlets before replacing the fuse. If it blows again, there might be a short in the outlet itself or the associated wiring.
• Trailer Wiring Fuses (Underhood F12, Rear F2, F3, F4, F5): Towing trailers can put a significant load on electrical systems. Blown fuses here are often caused by wiring shorts on the trailer, incorrect trailer wiring, or an overloaded trailer electrical system. What to check first: Inspect the trailer's wiring harness for damage, try connecting a different trailer (if available), or check for shorts in the seven-pin connector on the truck.
• Blower Motor Fuse (Underhood F13): If your HVAC fan stops working, this fuse is a common culprit. Often, a failing blower motor (drawing too much current) or a blockage in the blower fan can cause this fuse to blow. What to check first: Listen for any unusual noises from the blower motor. If the new fuse blows immediately, the blower motor itself might need replacement.
• Headlight Fuses (Underhood F7, F8, F9, F10): While less common, a short in a headlight bulb or wiring can cause these to blow. What to check first: Check the headlight bulbs for any visible damage or signs of burning.
• A/C Clutch Fuse (Underhood F14): If your air conditioning isn't blowing cold, but the blower motor runs, this fuse can be the issue. A short in the A/C clutch coil or a seized compressor can cause it to draw excessive current. What to check first: Cycle the A/C on and off and listen if the clutch engages. If it doesn't, and the fuse is blown, further diagnosis of the A/C system is needed.

Always remember to verify the fuse's function with your vehicle's specific fuse box legend, as configurations can vary slightly due to trim levels and optional equipment.

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