Troubleshooting Trailer Brakes Locking Up After Brake Controller Installation

Question:

I have installed the Pilot brake controller, and according to the digital readout it is correctly installed. It works fine most of the time, but on occasion, the trailer brakes lock up and are very difficult to release. I have used the wiring harness for the truck and it connects directly to the wiring on the controller, so it should not be wired wrong. Can you clarify why it is locking up. All fuses are intact.

asked by: Bill B

Expert Reply:

Most likely there is corrosion on the trailer connector of you vehicle, either on the front or the back that is causing the 12 volt accessory circuit of your 7-way to short out to the brake output circuit.

I also attached an FAQ article on troubleshooting brake controller installs as well as an FAQ video on testing a brake controller.

expert reply by: Jameson C