Since you are delving into electrical stuff oldhudson, here is the list of fuses and what they control, take from a 2012 model.
1. 10 Amp Water Pump
2. 10 Amp Air-conditioner shuts off
3. 15 Amp Propane detector, Water heater, Furnace
4. 10 Amp Inside lights
5. 20 Amp Fridge
6. 30 Amp Main battery With this pulled and the camper unplugged, nothing inside worked off the battery. This was the only fuse that shut off the stereo and the nightlight. With the camper plugged in, there is no effect.
7 40 Amp is marked as reverse battery polarity protection.
2012 Rockwood A122S
2008 Toyota Tundra Double Cab 4X4
Former owner of a 2002 Coleman Niagara GTE