Aside from the paranormal, there wouldn't be a way for the manual override knob of the Hayes Air Actuated Trailer Brake Controller # HA100400C to move on its own. This leads me to believe that either the unit is defective, there's a tiny air leak that the controller is picking up and causing it to activate, or there's an issue with your brake light switch wire and it's getting power somehow and sending the signal to the brake controller.
I'd start by checking each connection (air & electric)... view full answer...
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