Hi, I agree with Ferguson 30. Start unwrapping, or run a new wire from the switch to the motor, Tip: If your testor's leads are sharp, you can poke them into the wire's insulation and get continuity readings (or voltage readings) without permanently damaging the insulation. For example, attach one tester lead to the red wire at the switch, then poke the wire a few inches away from the switch, verify that you get a reading (you should), then move along the wire wherever you can access it, and find out in what section you are losing continuity. Do the same from the motor end of the wire The break has to be in between the switch and the motor. I hope you find the problem spot this way. If you can't find it, run a new wire and tape it to the wire harness where-ever you can, to protect it, and be done with it. Good luck, it is possible to fix.