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Have running lights on my trailer but when u step on the brake the lights on the trailer go off

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This sounds like a bad ground, check the ground wire, there should be a white wire coming off the wiring this wire should be grounded to the frame of the trailer, make sure that connection is clean and tight,and also make sure the plugs are clean, when you press on the brake it looses its ground and the lights go out, but also a bad plug would also cause this. after time the plug rots and the prongs dont make a good connection so take a look at both of these.

Posted on Jul 07, 2010

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