Bluesky... there is a fuse at the base of the relay behind the house battery. There's actually two fuses. One of them, an 8amp I believe, serves the stereo and door lock. Considering both are out, that is probably your culprit. The other fuse provides the control voltage for the battery disconnect relay. These fuses are one major PITA to get to. I find it best to slide the battery tray out, then get under the coach and reach up through the frame and blindly pull the fuses. Both of mine have blown while driving in heavy rains. Perhaps the relay base wasn't really designed for wet locations.
Brian, Mary, kids, beagle - Moose, and mutt - Maggie.
2012 Greyhawk 31FS
2013 Ford Explorer Toad