Troubleshooting Trailer Running Light Circuit Not Functioning on Vehicle
Published 02/21/2019
Question:
All trailer lights work except running lights. Trailer works fine on other vehicles. Brakes, turn signals work fine Thank You
asked by: SHANE W
Expert Reply:
First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester like # PTW2993 for voltage on all of the right pins when the taillight signals are being applied. Just like in the video I attached. Most likely you have a blown fuse on your vehicle for the running light circuit which is preventing it from working or you just have corrosion there which is preventing the circuit from functioning.
I attached a help article on trailer wiring troubleshooting if that does not solve the problem.
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