Drivers Side Running Lights Go Out when Brake Pedal Is Pressed
Question:
Running lights go out when I hit the brakes
asked by: Mark G
Expert Reply:
This sounds like a ground issue or the running light circuit is being overloaded which could be due to a short or lights that draw too much power. 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.
Inspect the wiring to the lights and fix any damaged or pinched wires as needed. If the lights are drawing too much power then switching to LED lights (see link) will solve that issue.
