Is she driving, and battery went dead? Should not have. NOT sure if Master Disconnect has to be ON for Chassis to charge House Battery. It DOES have to be ON for the onboard Converter/Charger to charge it. But that's only if there's 120-Volts-AC (from campground power pedestal or coach's Generator) available.
So is she Driving or Camped? If Camped with campground power, no need to turn the 12-Volt-DC system OFF. Should be ON to recharge the House Battery.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB