I was wondering if this ever got solved?
I'm sitting here right now, in my MH (2003 Windsor 40DST) and I'm having a similar problem.
I do have electrical systems working, and also not working. What appears right now to be the ONLY systems not working are interior roof lights and both Air Conditioners.
That being said, this coach does have some other electrical issues that appear to possibly be related to the ATS. It's an IOTA 50 and I am having an RV Tech come and look at it sometime after the 14th. Generator runs but it won't power bupkis.
Now, back to the current problem (no pun intended).
When I came back to the MH this evening I accidentally hit two switches climbing aboard. First the light switch, and VIOLA! All the inside lights came on as advertised. Next up, and don't ask me how this happened because I do not know, my backpack managed to press the BATTERY CUT-OFF SWITCH just inside the door, and shut everything hooked up to it, off, including the interior roof lights.
I re-engaged that switch and nothing came back on.
My wall receptacles work (I have a fan in front of me and this computer is also plugged in and working). So nothing with those systems. My microwave is flashing in it's I LOST POWER STUPID mode and my coffee maker is letting me know the power has been interrupted. At least that very important appliance is operational, as in the Fridge.
I'm sitting here, in the dark except for my railroad lantern, typing on the computer and trying not to sweat to death. Trying to sleep tonight without the A/C is going to be interesting.
I've turned off every breaker I can find, rotated both main battery switches off, cut power via the breakers on the pedestal outside, and turned everything back on. NADA. ZIP. ZILCH. Full stop.
I've turned off and on (lather, rinse, repeat, repeatedly) that battery cut-off switch but nothing is coming on.
Am I looking at a salesman's relay that has decided now would be a good time to give up it's ghost? Or something else? I don't have enough electrical knowledge of this MH to go testing, even if I had my test equipment with me. I can work on cars but this MH is way beyond my capability if I have to start trying to avoid electrocution. All that said, if I can find the relay in question, I can bypass that nasty little bugger easily enough.
Thanks for reading and let me know what y'all think.