Check the battery disconnect switch. It sounds like it is in the off position or it has failed. The quickest way to check it is to unplug the coach and see if all the lights go off.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.