Trailer Drivers Side Tail Light Not Working, All Other Lights Work

Question:

Hey guys I bought a hitch and wiring for my 2010 cx7 and it plugged in fine and when I went to turn the lights on, all the lights worked beside the driver side back light aka the license plate side. If u guys can help me out in any way please let me know. I made sure there was power going to it and it is. I have a power probe and when I gave the light power it worked so Im not sure y it is not working. Thank you guys

asked by: Anthony M

Expert Reply:

This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light.

Make sure that the vehicle side and trailer side connectors 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: Michael H