You know... The keyboard works a whole lot better.... When you plug it in.
If nothign, and I mean NOTHING happens. then the suspect list starts with totally dead And I mean DEAD!! batteries.
Disconnect switch (OFF or malfunction)
Bad connection
Blown fuse
Now if it was just one switch that woudl be on the list, but both of them kind, though not ruling it out COMPLETLY, makes it real, real far down the list.
Above that is a bad generator control system (The on-generator control computer) not much above both switches, but above it.
Steps to follow..
First find the big bolt with the red cap that says 12V+ beside it.. Check for voltage relative to the generator chassis. (And to the motor home chass9s) if either of those is zero, problem narrowed down to the power supply side. From there start looking for 12vdc.