Originally Posted by ctaylor738

4. When the ignition is turned on, the pump runs continuously, seeming to cycle between pressure and vacuum approximately 50 times, then stays quiet with an occasional burst of cycling. I conclude is that this is what fried the original pump motor.

5. While it is cycling, the reverse assist and locks work OK. It interrupts the cycling, does its thing, and then goes back to cycling.

So I (probably) have either a fault in the circuit board or valving in the pump unit, or bad input from a micro switch or a control unit in the system somewhere.