Trailer Running Lights Only Working on Passenger Side with a Kia Soul  

Question:

Expert Reply:

First, I am showing wiring harness # 118431 for a 2010 Kia Soul, so hopefully that is the one you are using. This sounds like a ground problem on the trailer. The running light circuit is on a different wire than the stop and turn lights, so it makes sense that those are working correctly. On the trailer, take a look at the offending light. Trailer lights usually ground through the mounting studs, unless there is an obvious ground wire. While back there, check that the bulb is intact.

In either case, mounted stud or wire grounded, make sure the grounds are attached to clean and corrosion free bare metal surfaces. Check the lights again after cleaning any dirt and corrosion.

If you are still having problems, check the trailer and vehicle side connectors for any dirt and corrosion and clean it out. With the trailer connected, use a circuit tester like # PTW2993 to test the running light wire directly behind the trailer side connector, and at several points leading back to the offending light. If you find any breaks or loose connections, fix as needed.

If the trailer has a lot of running lights on it, it may be too much for the vehicle wiring and the Tow Ready Wiring, # 118431, to handle. In this case you would either need to disconnect the extra lights or use a powered converter like # C59496.

expert reply by: Michael H

0