My 98 Beaver had a fuse in the circuit that was controlled by the transmission, which didn't allow the engine to start if it was in gear, I think. the fuse blew and caused me several days of anguish as I was in a park and had places I wanted to go........turned out the fuse was in a box hidden in the wall where the driver's door would be, below the levelling and transmission buttons on the armrest. YMMV
The symptoms were that everything else had power except the starter. following advice received I crawled underneath and cleaned all the contacts between the battery box and the starter, checked the solenoid, all while parked on a wet gravel site during a rainstorm while on my back in the wet. Monaco's help line finally found a guy who was on the line when my coach was built and remembered that they out the box in three seoarate places that year, depending on the options. The last place we looked was under the armrest.
Turns out that as the connectors corrode, the amperage on the fuse goes up, eventually blowing the 20amp fuse. So my time with a wire brush in the wet wasn't wasted, because clean connections lowered the amperage and saved my replacement fuse from blowing. Good times!