Troubleshooting Right Turn Signal On Trailer When All Other Lights Work

Question:

All my running lights work. And my left blinker and my brakes. But no right blinker on the trailer. The ground is good on the trailer.whats could be the problem?

asked by: Isaac

Expert Reply:

You will want to check the wire harness on your vehicle to make sure you are sending a signal to the trailer. You will want to use a circuit tester like part # PTW2993 to help find the problem. Have someone run through the functions on your vehicle and test each pin to make sure you have current. If not, then you may have a blown fuse or possibly a relay if you have any installed on the wiring. If that checks out, you will want to move to the trailer.

The first thing I recommend checking on the trailer side is the bulb on your right trailer light. It could be blown or possibly damaged preventing it from working. If that checks out ok you will want to inspect the wiring on the trailer, especially on the right side to make sure there are no signs of corrosion or damage like bare wires, cracks, or loose connections. If that all checks out then move to the trailer connector.

With the trailer connected to the vehicle check to make sure you are receiving current to the pin on the connector for the right turn signal(on standard wiring it is normally the green wire running to the right turn signal).

I have attached a helpful article that explains how to troubleshoot wiring you can check out.

expert reply by: Jeffrey L