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Troubleshooting Wiring Between My Truck And Trailer, One Brake Light Is Not Working Properly


My worker accidentally stepped on the plug connecting to my truck and trailer lights. All of the wires got ripped out when this happened. I reconnected all of the wires according to the schematic I found online but now my left brake light/tail light is dim. All of the other lights seem just fine. The left tail light lights up but you can barely see it. Can you help me determine what the issue might be and how to fix it? Its a Roadmaster enclosed landscaping trailer.


Expert Reply:

This could be an issue with your ground wire or you may have a short somewhere. Especially, since all your other lights are working properly. You will need a circuit tester, part # 40376, to check the voltages. I would check the voltages on your vehicle side. If your voltages are incorrect, you need to check the wiring on your vehicle side. I would trace the wiring back from your plug to your converter box, making sure all your wire connections are solid. If your voltages test correctly, you can move on to checking the trailer side. In order to test the wiring on your trailer side, you must plug in your trailer plug. Then you will test for power behind the connection between your vehicle and trailer. You will follow the same procedures.

If this does not solve the problem, you will have to check the grounds on your vehicle and trailer side. The grounds should be connected to bare metal, no paint at all. I have included a weblink describing this entire process below.

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