Don't know about Monaco, but in our MH we have a switch at the front step area that kills power to the 12v system when MH is in storage. I had this problem late at night on our last trip and flipped the switch on and off several time and the power came back on. This switch goes to the solenoid distributes the 12v to the different areas in our MH. In the near future I am going to replace the solenoid to insure I don't have a problem again as I have already replaced the switch once.
You might check and see if you have a similar setup.