2017 Chevrolet Silverado 3500HD Fuse Box Diagram & Amperage

Quick Answer

The 2017 Chevrolet Silverado 3500HD has multiple fuse box locations:

• Underhood Fuse Block: Located in the engine bay, on the driver's side.
• Instrument Panel Fuse Block (Left Side): Located on the left side of the dashboard, accessible when the driver's door is open.
• Rear Underseat Storage Fuse Block: Located under the rear seat, on the driver's side.

Underhood Fuse Block

The underhood fuse block is the primary power distribution center for many of the vehicle's major electrical systems. It also houses many relays for various functions. Always refer to the fuse box lid diagram for exact fuse locations and amperage ratings, as these can vary slightly by trim and options.

Relay Locations (Common):

• 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: Trailer Brake Relay

Instrument Panel Fuse Block (Left Side)

This fuse block primarily handles interior electrical components and accessories. To access it, open the driver's door and locate the panel on the side of the dashboard, typically requiring a trim panel removal tool or a flathead screwdriver to gently pry it open.

Rear Underseat Storage Fuse Block

This fuse block provides power to some rear-specific components and often auxiliary power outlets. It's typically found by lifting the rear seat on the driver's side.

How to Test a Fuse

Testing a fuse is a straightforward process that can help diagnose electrical issues before replacing parts. You will need a fuse puller (often found in the fuse box lid or with the spare tire tools) and a multimeter or a fuse tester.

1. Locate the Fuse: Identify the suspect fuse using the vehicle's fuse box diagram. Always turn off the ignition and any affected components before testing.
2. Visually Inspect: Many fuses are transparent, allowing for a visual inspection. Look for a broken wire inside the fuse. If it's broken, the fuse is blown and needs replacement.
3. Use a Multimeter: If a visual inspection isn't clear, or for opaque fuses, use a multimeter. Set the multimeter to the continuity setting (often indicated by an audible beep symbol). Touch one probe to each metal test point on the top of the fuse. If the multimeter beeps or shows a reading close to zero ohms, the fuse is good. If there's no beep or the reading is "OL" (open loop), the fuse is blown.
4. Use a Fuse Tester: A dedicated fuse tester is even simpler. Insert the fuse into the tester. If the light illuminates, the fuse is good. If it doesn't, the fuse is blown.
5. Replace with Correct Amperage: Always replace a blown fuse with a new one of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common Blown Fuses on This Vehicle

While any fuse can blow under the right (or wrong) circumstances, some circuits are more prone to issues due to their high usage or the components they protect. For the 2017 Chevrolet Silverado 3500HD, common blown fuses often include:

• Cigar Lighter / 12V Outlets: These fuses commonly blow due to overloading from charging multiple devices, using high-power accessories, or inserting a faulty plug. If your phone charger or other accessories stop working, check these first.
• Trailer Wiring / Trailer Brake: Given the HD nature of this truck, trailer-related fuses can blow from short circuits in trailer wiring, overloading the trailer's electrical system, or issues with the trailer brake controller. If you lose trailer lights or trailer braking, these are prime suspects.
• Blower Motor: A high-usage component, the blower motor fuse can blow if the motor starts to seize up, if there's a blockage in the HVAC system putting strain on the motor, or if there's a short in the wiring.
• Radio / Infotainment: While less common than the others, issues with aftermarket radio installations, shorting wires behind the dash, or internal failures within the infotainment unit can cause these fuses to blow.

Always check for the underlying cause before simply replacing a blown fuse. A fuse blows for a reason, and simply replacing it without addressing the root cause will likely lead to another blown fuse. If a fuse repeatedly blows, it indicates a more serious electrical problem that should be diagnosed by a professional.

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