That was/is my thought as well. However, I have by passed the coach wiring with jumper wires for the ones that engage the solenoid to engage the motor (motor is on a separate circuit) and it still blows a fuse. According to the Lippert wiring diagram the only wire I have not by passed is the ground wire, that may be my next move. However, that raises another small question, the diagram shows that ground wire to be black, the wire on the switch is brown. Did they use the wrong color of wire, or does that brown go somewhere else?