Why is only one side of my trailer lights working?

Close-up of a jumper wire Alligator clips at the wire ends make continuity connections quick and easy. If the lights on one side still aren’t working, you may have a break in the wire. To test for a broken wire, check the color of the wire going to the socket and then find that wire on the connector in front.

Do trailer lights have a fuse?

If you’re problem was turn signals then simply look for the trailer RT or LT fuse and simply replace if needed. This will solve the problem of brake lights also, as they are the same fuse.

Why do my trailer lights work with one vehicle but not another?

Expert Reply: It could be a somewhat weak ground on the trailer that allows the lights to work with one vehicle but not with another. What you can try doing is running a ground wire from each of the light assemblies back to the main ground of the trailer.

Why are my running lights not working?

Check the contact point of the bulb for melting. Check the fuse if both daytime running lights are not working. If the fuse is blown, there is likely another condition with the electrical circuit, like bad sockets or a wiring issue. The ambient sensor could also be disconnected or faulty.

Why does my left trailer light not work?

The first thing to do is check the fuses on your tow vehicle. Next, inspect and test the connector at the rear of your tow vehicle with a circuit tester, like # 40376. If the problem is there then you need to clean it, if necessary, and if that doesn’t fix it the problem is in your vehicle.

Where is the fuse located for trailer lights?

Stop and Turn Signals Work But Tail Lights Do Not Work on Trailer The first thing I would check is the trailer wiring running light fuse located in the power distribution box under the hood. Once the fuse box is located check the legend on the lid to determine the correct fuse to check.