2014 GMC Sierra 1500 Fuse Box Diagram

Quick Answer

The 2014 GMC Sierra 1500 has two primary fuse box locations:

• Under-Hood Fuse Block: Located on the driver's side of the engine bay, near the battery.
• Left Instrument Panel Fuse Block: Located on the driver's side of the dashboard, accessible when the driver's door is open.

Under-Hood Fuse Block

This is the main fuse block, containing high-amperage fuses and relays that control core vehicle functions. Always disconnect the battery before servicing high-amperage fuses or relays.

Relay Locations (Under-Hood)

• 53: Starter Relay
• 56: A/C Clutch Relay
• 58: Fuel Pump Relay
• 60: Run/Crank Relay
• 63: High Beam Headlamps Relay
• 64: Low Beam Headlamps Relay

Note: Your truck's fuse layout may vary based on trim level (WT, SLE, SLT, Denali) and options. Always check the diagram printed on the inside of the fuse box cover to confirm fuse locations and ratings.

Left Instrument Panel Fuse Block

This fuse block is located inside the cabin, on the driver's side end of the dashboard. It is typically hidden by a trim panel that can be gently pried off. It handles most of the interior and accessory circuits.

How to Test a Fuse

Testing a fuse is a simple process. A "blown" fuse is one where the internal metal filament has broken, interrupting the electrical circuit to protect the component from damage.

1. Safety First: Turn the vehicle's ignition completely off.
2. Locate the Fuse: Identify the suspect fuse using the diagram on the fuse box cover.
3. Remove the Fuse: Use a fuse puller (often included in the fuse box) or a pair of needle-nose pliers to gently pull the fuse straight out of its slot.
4. Visual Inspection: Hold the fuse up to the light. Look at the metal strip inside the colored plastic body. If the strip is broken or melted, the fuse is blown.
5. Multimeter Test (Optional): For a more definitive test, set a multimeter to the continuity setting (it often looks like a sound wave symbol). Touch one probe to each metal blade on the top of the fuse. If the multimeter beeps or shows a reading of near-zero ohms, the fuse is good. If it remains silent or reads "OL" (Open Line), the fuse is blown.
6. Replacement: If the fuse is blown, replace it with a new fuse of the exact same amperage rating. Using a higher-rated fuse can cause a fire.

Common Blown Fuses on the 2014 GMC Sierra 1500

While any fuse can blow, some are more common due to the nature of the circuits they protect.

• 12V Power Outlet / Cigar Lighter Fuse: This is one of the most common fuses to blow. It's often caused by a faulty phone charger, an object falling into the socket and shorting it out, or plugging in a device that draws too much power. If this fuse blows, first inspect the socket for any foreign debris before replacing the fuse.

• Trailer Brake / Trailer Light Fuses: If you frequently tow, these fuses can blow due to shorts in the trailer wiring. Water intrusion in the trailer-side connector is a very common culprit. Before replacing the fuse, inspect both the truck's and the trailer's connectors for corrosion or damage. Test the lights with a different trailer if possible to isolate the fault.

• Fuel Pump Fuse/Relay: If your truck cranks but won't start, the fuel pump fuse or relay is a good first check. A failing fuel pump can sometimes draw excess current and blow the fuse as a final warning before the pump fails completely. If you replace the fuse and it blows again immediately, the pump motor is likely seized or has an internal short.

If you're facing persistent electrical issues or aren't comfortable performing these checks yourself, it's always best to seek professional help. Find a trusted shop on Repairius.