Running Lights Work But No Tail Lights Working

Question:

Replacing tail lights with new submersible lights. Have red connector sensor lights on the connection coming from my truck. They light up as if the connection is pure. Side running lights work. Not the new tail lights. Decided to hook up the old to check. Now they dont work. Sensor light is still saying there is proper connection

asked by: Marc

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 but can show up any time.

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.

If none of the above steps allow you to solve the problem, please let me know and I would be glad to offer further assistance.

expert reply by: Conner L