Ok, problem fixed, but I am embarrassed. Thanks for helping me focus on the circuit breaker. Yesterday was a long day, and seeing that the wire coming out of the circuit breaker for power supply was coated in black conduit with a ring of black electrical tape around it at the terminal ring, I assumed Skier's Choice was telling me this was a ground. It was not
The system is loud, and I love my WS420 so far.
Thanks guys!
J