Troubleshooting Trailer Wiring that is Dim on One Side of Trailer

Question:

I installed exactly how the video showed and the passenger side works great but the drivers side is vary faint? Went back through twice and still the same? Any suggestions or do I need to get a different harness?

asked by: Jarod H

Expert Reply:

Sounds like the problem is actually on the trailer side of the equation. Most likely the grounds on the driver side of the trailer wiring are insufficient and causing the lights to illuminate dimly.

Make sure that the trailer side connector are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.

expert reply by: Jameson C