[EricH]

Troubleshooting: Find source of problem.

This means checking all the wires going into the Victor. Trace them back to wherever they originate. Test the breakers, the connections, everything. All wires includes the PWM cables, by the way, even though I'm fairly certain they aren't the problem.

If you don't find the problem before the breaker panel, figure out where everything on that panel goes. Do any of those have problems? If so, it's probably in the panel or "upstream" somewhere. If not, check the breakers.