2018 Chevrolet Silverado 1500 Fuse Box Diagram

Quick Answer

On the 2018 Chevrolet Silverado 1500, you will find three primary fuse box locations:

• Engine Compartment Fuse Block: Located on the driver's side of the engine bay.
• Left Instrument Panel Fuse Block: Located on the driver's side of the dashboard, accessible when the driver's door is open.
• Right Instrument Panel Fuse Block: Located on the passenger's side of the dashboard, accessible when the passenger's door is open.

Left Instrument Panel Fuse Box Diagram

The left-side instrument panel fuse block is located on the outer side of the driver's dashboard. You will need to open the driver's door fully to access the cover.

Relays

• R1: RUN/CRANK Relay

Right Instrument Panel Fuse Box Diagram

The right-side instrument panel fuse block is on the outer side of the passenger dashboard. Open the passenger door to access the panel cover.

Under-Hood Fuse Box Diagram

This is the main fuse and relay center, located on the driver's side of the engine compartment. Remove the large plastic cover to access the fuses and relays.

Relays

• R2: A/C Clutch Relay
• R5: Starter Relay
• R7: Fuel Pump Relay
• R8: Run/Crank Relay
• R10: Rear Defog Relay
• R11: Horn Relay

Note: Fuse numbers and circuits can vary based on your truck's specific trim level and options (e.g., LT, LTZ, High Country, Z71). Always verify the diagram printed on the inside of your fuse box cover.

How to Test a Fuse

Testing a fuse is a straightforward process.

1. Safety First: Turn the vehicle's ignition completely off.
2. Locate & Remove: Find the suspect fuse using the diagram and gently pull it straight out with a fuse puller tool. Many vehicles have a puller located in the fuse box itself.
3. Visual Inspection: Hold the fuse up to the light. Inside the plastic body is a small metal strip. If this strip is broken or looks burnt, the fuse is blown.
4. Multimeter Test (Recommended): For a 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 zero (or near zero) ohms, the fuse is good. If it remains silent or reads "OL" (Open Line), the fuse is blown.
5. Replacement: If the fuse is blown, replace it with a new fuse of the exact same amperage rating. Using a higher amp fuse can cause a fire.

Common Blown Fuses on the 2018 Silverado

• Radio / Infotainment (Right Instrument Panel, Fuse #12): If your radio or touchscreen suddenly goes black, this fuse is the first place to look. The issue is often the unit itself, but a blown fuse can happen if there's a voltage spike.
• Cigar Lighter / 12V Power Outlet (Right Instrument Panel, Fuse #13 or #14): These fuses commonly blow when a faulty phone charger or other plug-in accessory creates a short circuit. Check the accessory you were using for damage before replacing the fuse.
• Trailer Brake / Lights (Under-Hood & Left Instrument Panel): If you use your truck for towing, trailer wiring is a frequent culprit. A short in the trailer's wiring can blow fuses for trailer lights, brake controller, or even your truck's tail lamps. Always inspect the trailer-side plug and wiring harness first.
• Fuel Pump (Under-Hood, Fuse #F10): If your truck cranks but won't start, checking the fuel pump fuse and relay is a critical diagnostic step. While a blown fuse could indicate a wiring problem, it can also be an early sign that the fuel pump motor is failing and drawing too much current.

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