Emergency Lights Not Working Properly

Expert Reply:

The first thing I'd do is try to narrow down whether the wiring problem is on the vehicle or the trailer side. With the trailer not connected, use a circuit tester and check all the pins on the 7 way. Make sure you activate that pin's function as you test it. Then plug in your adapter, and test that. If all these items check out OK, then the problem is somewhere on your trailer. Trace the wires for the left hand signal and brake back from the trailer connector. Look for corroded connections and pinched, broken, or frayed wires. If you aren't getting a signal at the connector or adapter, check the owner's manual for the location of the fuses that control the towing circuits, and make sure there aren't any that are blown.

expert reply by: Mike