We have a 2009 390BH after running a space heater, and blowing something, we reset the fuses it didn't work then while explaining it to a friend we suddenly had power. The next time I went in the coach, no power. Took it to the shop, power, brought it home, no power. Played with the "store/use" switch, we had power, then no power. The battery indicator goes from full to empty. Please help. We are plugged into 50 amp. Thanks!