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Did someone accidently turn off the battery disconnect solenoid switch? How old is the start battery?
This might be dirty cable connections or it may be that the key switch is going bad. No clicking at all?
How old is the start battery? Sometimes when they start to fail they will just go dead all of a sudden and then sometimes work fine. This usually is when there is an open connection inside. I just had one do that in my car not long ago. Would work fine for weeks and then nothing..........then work again when I jumped it for a week or two, then again. When I replaced it I never had any more problems. Any chance the lead on the switch may have come loose?
Main battery wire to the key switch..........maybe the connection came loose. IF you have a 12 VDC test light you can check that pretty easily.
Look for loose connections and power INTO the switch with a 12 VDC test light. IF no power INTO the switch, then you need to look in the Battery Control center for a bad relay or connection or blown fuse. IF this has an RV Custom Products system, it may have burned the board. Happens a lot on these Fleetwood units.
Just checking back to see if you were able to track this down? Thanks!