If you have no DC power while under shore power or generator but you have 120v power, check and see if there is a 50 or 100 amp breaker in or near your coach battery box. In the Axis, it is in the back left hand corner and it disconnects the coach batteries from the coach. It has a red or yellow button which, when pushed, lets out a red or yellow flag which shows the the batteries are disconnected from the coach. Push the flag back in and, like magic, everything will work. If that does not solve the problem, the next thing to look at is to see if the use/store switch is working. You should hear a “thunk” when you switch it.