That is what I was thinking is that there must be another power wire coming off the radio. It was way to hot to go digging around under there to have a good look.

If I can get the radio to run without the master button pushed then I would not move any of them. To run amps and such do you still use a circuit breaker or just a on/off switch so when you park you just turn a switch off? Are breakers/fuses needed for this stuff?