Troubleshooting Right Tail Light Brake Light Not Functioning When All Other Functions Work

Question:

Hello i have a 30ft keystone trailer and the right side brake light isnt working All run lights and turn lights work and left brake light works but not right side.. All bulbs are new and tail light assembly are new.. any help would be Greatly appreciated.. thank you for your time.

asked by: Robert H

Expert Reply:

The brake light on the right side, because it is all new likely has a bad ground wire connection. Most of the time the ground wire is connected through the mounting hardware and needs to be connected bare metal to metal. Before testing that ground wire, I recommend first simply cleaning the trailer wiring connectors on both the vehicle and trailer side of the connection with some sand paper to ensure the connections are clean and free of debris or corrosion.

You can use the circuit tester # PTW2992 to test the wiring if the issue isn't easily solved by either cleaning the connections or repairing the ground connection on that specific light.

expert reply by: Jason S