Finding the Fuse for Trailer Lights Made Easy: 1 Minute to Locate and Replace Your Trailer Light Fuse

If you’re having trouble with your trailer lights not working, one of the most common causes is a blown fuse. Locating the fuse for trailer lights can seem intimidating, especially if you haven’t worked with vehicle electrical systems before. First, check your vehicle’s owner’s manual for the layout of the fuse box—it will often indicate exactly where the fuse for the trailer lights is placed. Typically, the fuse for trailer lights is found in the main fuse box under the hood or sometimes inside the cabin beneath the dashboard. The fuse may be labeled as “TRAILER,” “TRLR,” or something similar. Use the diagram on the fuse box cover to help narrow it down.

If you don’t have access to a manual, start by inspecting all fuses related to lighting or towing. Use a fuse puller or needle-nosed pliers to gently remove the suspected fuse and hold it up to the light—if the metal strip inside is broken or discolored, it needs replacing. Whenever replacing a trailer light fuse, always use one with the same amperage rating to avoid electrical issues.

As an interior designer, I understand the importance of creating seamless lighting—whether in a room, or for practical exterior functions like trailer lights. Just as thoughtful lighting design can elevate an interior space, ensuring proper function and placement of trailer lighting contributes to safety and aesthetics on the road. For design projects that integrate home and automotive features, digital tools such as a room planning tool can help visualize different lighting scenarios to ensure every environment—mobile or stationary—is both functional and beautiful.

Tips 1:

Before replacing a fuse, check your trailer’s wiring connector for any corrosion or loose connections. Often, cleaning these components can resolve lighting issues without the need for fuse replacement.

FAQ

Q: What size fuse do I need for trailer lights?

A: Most trailer light circuits use a 10- to 20-amp fuse, but always check your vehicle’s manual or fuse box diagram for the correct amperage.

Q: Where is the trailer light fuse located?

A: It’s usually in the main fuse box under the hood or in a secondary fuse box under the dashboard—look for labels like “TRAILER” or “TRLR.”

Q: Why did my trailer lights stop working suddenly?

A: Possible reasons include a blown fuse, wiring issues, corroded connectors, or a malfunctioning trailer light bulb.

Q: Can I use a higher-amp fuse if I don’t have the right size?

A: No, always use a fuse of the correct amperage to prevent electrical hazards or damage to your vehicle’s wiring.

Q: What’s the best way to test if a trailer light fuse is blown?

A: Remove the fuse and hold it up to light; if the metal strip inside is broken, replace it. Some vehicles also allow you to swap a known good fuse of the same rating temporarily as a test.