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Troubleshooting Trailer Wiring Running Lights Not Functioning After Wiring Install


Hi ive just received the wiring and installed it. But the running light doesnt light up on the trailer. I test the trailer with another car and all was ok on the trailer. the brake and flasher are ok. Only the running lights doesnt work. can you help me with that. Also I test the wire next to the ground and there no current on it with the running light ON. I have 12 volts on the fuse also. its very strange please help me...


Expert Reply:

Sonds like the problem is the trailer wiring kit part # C56407 that you referenced. Typically when this happens if you unplug and replug the connectors of the kit back in the circuit will make the appropriate contact and the circuit will come back on.

So what you'll want to do if that does not fix the problem is use a circuit tester like # PTW2993 to test the brown wire that comes off of the connector than runs to the left taillight (one with yellow wire) to see if there is voltage there when the running lights are on. If so, then the problem is a converter box problem. If not, then the problem is still a connection problem from the taillights to the kit.

expert reply by:
Jameson C

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