Where are the fuses for trailer lights?

You can usually find the main fuse box under the hood. Your owner’s manual should tell you where the fuse box is located and where in particular you can find the running lamp fuse. All this being said, you’ll want to make sure the wiring on the trailer is in good shape before you start changing fuses.

Why wont my trailer lights work?

Many trailer problems are due to a poor grounding connection, which is usually the white wire coming out of the trailer plug. If the ground is poor, lights may work intermittently or not at all. Even if the wiring to the plug is adequate, make sure that the ground connections to the trailer frame are good.

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

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.

How do you test a trailer wiring with a multimeter?

To test your trailer plugs, turn your multimeter to volt DC settings, then connect the black probe to the negative terminal and your other multimeter probe to one of the positive pins, and turn on the light that is controlled by that pin.

Do LED trailer lights need to be grounded?

Expert Reply: Yes, all of the lights in the # TL16RK Waterproof, Over 80 inch Trailer Light Kit will need to be grounded. The white wires on the tail lights are attached to the trailer frame, and the chrome bases provide the ground to the trailer frame through the mounting hardware for the side marker lights.

How can I check the wiring on my trailer?

Check the trailer wiring by running a continuity test by connecting a jumper wire to the connector pins and a continuity tester to the sockets. Connect the jumper wire to one of the pins in the trailer socket. A continuity tester contains a light bulb and a battery.

What to do if lights on your trailer are not working?

Connect the jumper wire to one of the pins in the trailer socket. A continuity tester contains a light bulb and a battery. The bulb lights when a circuit is good. 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.

Where does the white wire go in a trailer?

The White Wire is the “Ground” or “Negative” wire connecting to the vehicle battery “minus” side. The trailer wiring diagram shows this wire going to all the lights and brakes. Also, it must connect with things (if included) that use the Aux Power and Back-up lights too.

How do you troubleshoot a trailer brake wire?

Just go ahead and pierce the wire and make sure you have got power going through the box. And then you want to do that for the other remaining circuits, too. Like, for instance, the brake light. Separate the brake wire and pierce it and tap the brakes, and okay you have input going there. And then you would do the same thing again to the other two.