Troubleshooting Trailer Wiring with 4 Pins but 5 Wires With Trailer Lights Not Working
My mechanic installed this Curt 4-wire system on my 2012 Volkswagen CC. My utility trailer also has a 4-pin connector, but 5 wires are coming out of it. Juice is definitely coming out of the car tested with a wire tester, but none of the lights...
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