In your first post, you
"- Turned on the main house power switch"
And in your most recent post,
"main power switch has a light when it's powered on"
Which Switch is this? I'm taking it that the one you mention (close to the door step well in our Jayco) is the Battery Disconnect, that you shut off when not using the coach so the parasitic stuff like LPG Detector don't run the battery down. Is that correct?
If so, sounds to me like the Latching Relay near your House Batteries has failed. Guy that looks like this?
Disconnect your house batteries again, check the connections at that relay, and try again. If you can do this safely, without grounding to metal surrounding the relay, you could use a jumper cable to connect the two large terminals of the relay. That would bypass it and you could see what works then.
I forget the details, but if I recall correctly, there are two versions of those relays. Different in how they are energized to Latch and Un-Latch.
Be sure you understand "Latching" It means the Relay is powered intermittently and stays in whichever position it flipped to. Then no power is required to keep it there, only to flip it again. Think of a ballpoint pen. Click to Extend and it stays, Click to Retract and it stays. It may LOOK like a "starter solenoid" but it isn't since those don't latch. They're like a ballpoint you have to hold down to keep the point out.
