SteveS, Thank you so much for taking the time to run the tests and report back with what you were able to find out. This helps to give me a starting point in diagnosing my buddies air conditioning problems.
As it turns out, I think he has the same year and model Alpine as yours. He has been plugging his power cord, using adapters, into a 15 or 20 Amp standard house plug outlet in his garage and running either the front or rear air conditioner for several years now with no problems. Now for some reason he can only run the rear air and when switching to the front air he gets nothing. Now, when he starts the generator, he can run either the front or rear or both.
I'm leaning towards a problem with the transfer switch and from what I've read on this forum can and will eventually go bad. I have never had to get into diagnosing transfer switch problems, so I'm kind of at a stand still.
I hate throwing parts at a problem, but it appears that this must be the bad link.
Sammie ( Steve ) Also