1999 Chateau 31N Aux Battery Problem

[fairview]

Hoping someone can point me in the right direction. I have no aux battery power on my class C unless a) motor is running or b) generator is running. Plugged in I'm fine. The power is not even low... it's like the cutoff switch is flipped. I've read a little about a solenoid under the hood that might cause this problem. If so, how can I test this? Any other ideas?
Thanks in advance.

[auto]

Can you hear the solo click when the switch is pushed? With a test light test for power at both large lugs. If you have power to only one side and your sig. wire is ok it is the solo. If you find no power on any of the large lugs test voltage at aux. batt.

[fairview]

Generator will not run unless engine is running... I shut off the engine and the generator cuts off immediately... still working on testing the sol' per your original comments. Batteries both test over 13volts & everything works when "plugged in."

[fairview]

Nothing. That's gotta be it. I may never know. Selling the coach tomorrow. I'll tell the new owner what I know... already told him there was a problem, just didn't know what it was. Thanks for the help... I learned something!