Running Lights Turn Off When Brake Pedal is Applied

Question:

got all lights on trailer working but if got running lights on and hit the brake thet go off

asked by: Chauncey L

Expert Reply:

It sounds like you have a short somewhere. This is the result of a bad ground or some damaged wiring.

Check your grounds and make sure they are secure and connected to clean, bare-metal surfaces and that your wiring isn't damaged or pinched. You can also check the connector on your tow vehicle and trailer to see if there is any corrosion. If you do find corrosion in either connector clean it out and apply some dielectric grease # 11755.

Let me know if this doesn't fix your problem and I can help you troubleshoot further.

expert reply by: Jon G