Trailer Running Lights Do Not Work When Connected to a Honda CR-V

Question:

Turn signal lites and brake lites work but running lites dont. I have a 4 pin flat connector. Not sure how good the grounds are on trlr. I had to use a converter to go from 7 points on trailer to 3 and the ground on the crv.

asked by: Bill

Expert Reply:

So it sounds like you are using an adapter like # 37185 or something similar. You need to make sure the adapter is grounded to the vehicle frame otherwise it will not work properly.

It could also be a ground issue on the trailer. 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