All Trailer Lights Work Except for Running Lights
Question:
I have a 2013 ram cummins 2500. My trailer left, right and brake signals work, but not my running lights. Where is this dude located? Could it be anything else?
asked by: Travis
Expert Reply:
If it is a fuse (or relay) you can find the location using the legends on the lids of the under hood and in cab fuse panels to locate the circuits related to the tow package wiring. If it is not one of those then it is likely a bad ground or other weak connection causing the trailer running lights to not work.
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.
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