Originally Posted by danm1130
Thanks BAMA Rambler. I am trying to hook up a 4 wire harness to the trailer so I can plug it into a 4 wire connector on the tow vehicle. I have the wiring correct, but I don't have the left turn and brake lights.
The problem could be in the tow vehicle. Does the trailer (as modified) pass the test when powered by a different car?
You could try a test with a 9 volt battery and a snap pigtail from Radio Shack. Touch a lead to the ground and the other to the circuit you want to test. Have a friend watch for a glow at the bulb.
You can use a volt meter to check the car end of the plug.
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