[rickst29]

Dodge Trucker and Bill are correct with regard to ceiling lights in your older 2007 - the bathroom wall plunger switch was critical for that power path to light ceiling lamps. But that switch would not have effected the refirigderator or the water pump, or other related 12v things which do not depend on the wall switch.

Your original post ("Everything works" after you provide 12v power from the truck) pointed Shane to the correct diagnosis. When the truck is has been disconnected, the alternate power sources are a charged battery or the "power converter main board" within bottom portion of the WFCO unit.

When plugged in, the WFCO "main board" provides power to both charge the batteries AND run everything else, it ihas failed at at both jobs. the board is dead, and should be replaced. (Whether your your deeply discharged battery is recoverable s a related question for later).

hat replacement should probably not a an actual WFCO replacement board, but none of the alternatives actually provide everything I want - high power, high efficiency (no fans should be needed), with cellphone programming on the fly.

Lots of choices, none totally satisfactory. A search on "power convert board replacement" will bring up a lot of alternatives.