If it isn't fixed by tomorrow, call the Monaco tech support, which is easy to find on their web site. They have been excellent help on the few problems we have had in our new-to-us 1998 Windsor.
In earlier models like ours, the solenoid is back in the engine bay - I don't know what year it was moved. Also, there are separate ground connections for AC and DC - check the ground. We had one issues where there was a huge voltage drop across the solenoid and the DC was barely working - the problem was the ground.
We recently had all the AC go completely out because the main circuit in the had died. If the batteries are down and it's because the charging in the inverter is out, prepare to open your wallet - ours cost $2500 installed. Also if those are 12-volt batteries and they're flat, disconnect the batteries and get a charger on them. Sitting dead will kill batteries.
If none of this helps, call Monaco.
