I have a 1986 Comanche Ranger bass boat trailer. It has the surge disc brake system on it. The problem that exist is that the actuator switch is flipping anytime the trailer moves, which ativates and locks up the brakes. I get out of the vehicle lift the little tab by the trailer tongue to release the lock and when I try to back again or move forward sometimes it ativates again and locks the brakes again. I have looked at the wiring harness and everything seems well connected fom appearance. The lights work good and nothing seems seized up, so what is the malfunction.