Troubleshooting Trailer Wiring Where Not all Circuits Function Consistently

Question:

I havent used the trailer in 2 years and I cleaned all the plug connections first and once I plugged in the trailer to the truck everything worked. After 5 minutes the only thing working was the tail and brake lights on the trailer. Then I unplugged them and plugged them back and nothing worked. Then I plugged them up again and the only thing working was still just the trailer brake lights and turn signals. The trailer lights and tail lights do not work but the brake and turn signal lights do on the trailer. What is going on????? Thanks

asked by: Jim

Expert Reply:

Sounds like an intermittent ground connection which is causing bizarre behavior from your trailer lighting. Trace the ground wire from the connector on the trailer and make sure it's making a solid connection to the trailer frame. You can also try running a jumper wire from it to the ground wires of the light assemblies and the should help as well.

expert reply by: Jameson C