DC Power Not Working
 

Batter fully charge 12 volt system not working all fuse good 2005 28 c just quit working any suggestions

Ground Fault Interrupter tripped? Master Switch in the "camping" position?

- Jack

DC Power not working
 

I've had a failure of my master control switch. This caused a DC power failure. Best to get a higher capacity switch.

Possibly the battery terminals have corrosion and are isolated/insulated from the wires. So, no power goes to the camper, or not enough. Common on vehicles. Remove battery terminal clamps, and clean, even if they look clean clamps and terminals, and replace. Good thing to do here and there anyway.
Auto parts store has terminal cleaning tool very cheap.

Look for an inline circuit breaker near the battery. It is a little box with two electrical studs an there may be a reset button on it. Check for power on both studs. A multi-meter will help.