OK, thanks all.
The battery is only a year old, so it should be good.
I thought the propane detector would be wired on all the time, but did not think of the radio as Barney suggested. I will check that.
There is no fan that comes on that I know of.
My next plan is to go into the fuse box and pull a fuse or 2. There is just so many things on this rig that it could be. Each storage area has a motion light that comes on and should go off when the door is closed. Those are noted for not shutting off. It I can't find it I will get one of those cut offs that attaches to the battery terminal.