Why does my fuse keep blowing for my trailer lights?

You have a short circuit somewhere that is causing the fuse to blow. Likely causes of a short on a vehicle include a dirty or corroded trailer connector or damaged wiring. Make sure the trailer connector is clean (go ahead and do the same for the trailer side connector while you’re at it).

Where is the fuse for the trailer running light?

For anyone else who has this problem, check fuse J14 in the fusebox under the hood. The fuse locations are printed on the underside of the fusebox lid. J14 is a 20 amp female maxi fuse that protects the trailer running light circuit. Mine was blown.

What causes trailer tow lights to keep blowing?

When you drive, and hit a bump or a curve, the wiring in the trailer moves a bit, the bare part shorts to the frame, blowing the fuse. When stopped, if the bare spot isn’t touching the frame, the fuse will hold. Mice are the worst… Click to expand… Yes, I drove around with the trailer connected to the Yukon.

Why is my tow package running light not working?

If it is the tow package running light fuse that is blowing then there is most likely a short in the trailer wiring or in the trailer or vehicle side connector. What you will want to do first is make sure both the vehicle side and trailer side connectors are clean and free of corrosion inside and out.

Why do my tail lights keep blowing fuses?

I’d put a 35″ spare under there a couple of months ago and it was a tad loose. The spare had been swinging slightly and pressing a harness between the tire and the trailer hitch. It wore though the insulation and was causing an intermittent short. Secured the harness away from the tire, wrapped up the damaged wire and no more blown fuses!

Why do trailer lights keep blowing trucks fuse?

There is a 20 amp fuse in the passenger kick panel that controls the trailer’s running lights (brake lights and turns are another circuit) that keeps blowing. Interestingly we also have an 2001 Expedition with factory tow package that doesn’t have this problem. Truck is like new (24k miles) and just developed this issue. Any ideas?

What to do if your running light fuse keeps blowing?

Replace the fuse and then use a circuit tester such as # PTW2992 to test the vehicle side trailer connector while someone sits in the vehicle and turns on the running lights. If it shows power and the fuse does not blow then the issue is on the trailer. If it does blow the fuse then the issue is on the vehicle.

Can a truck running light not work on a trailer?

The truck’s running lights will work, but the trailer won’t if the fuse is blown. They fuse the trailer running lights seperate from the trucks, so if you have a bad connection or ground the connector out, it will blow the trailer running light fuse, but the truck will be fine.