Only the Left Trailer Brake Light Does Not Work on a Big Tex Trailer
Updated 07/28/2015 | Published 07/27/2015
Question:
Tow vehicle works fine and using a tester I have all the correct signals on the outlet of my 7 pong to 4 prong connector to trailer. All trailer lights - running, right turn and brake both work and left turn signal works. However I do not get a brake light on the left side, only on the right? How can this be?
asked by: Mike B
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 pop up anywhere.
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.
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