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Troubleshooting All Trailer Lights Except the Brake Lights Are Functioning


Every thing is working except brake lights what is wrong


Expert Reply:

I would start with checking the ground wire, as that's the most common issue when some circuits work and others don't. If the ground connections are all firmly attached to paint and rust free spots on the frame, then I would test the wiring harness on the vehicle to see if you're getting power on the pin for the brown wire. This would let you know whether the issue is on the vehicle or on the trailer. If the issue is on the vehicle you'll want to use a circuit tester to make sure that the wire you've connected to receives power when the brakes in the vehicle are pressed; you'll need a circuit tester like the # PTW2993 to perform this test.

If these basic steps don't get your trailer wiring working, let me know and I can continue to troubleshoot this with you.

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