The first thing I recommend doing is using a circuit tester like # PTW2993 to test the pins at the vehicle side connector. This will help isolate the problem to either the vehicle side or the trailer side. Test the running light pin at the connector while the function is activated on the vehicle. If you do receive a signal there, you know the issue is somewhere on the trailer side. If you don't get any signal, you can focus your attention on the vehicle.
If you didn't get any signal at... view full answer...
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