Just for future reference, if you get your generator running, it will be providing power to the 110-volt receptacle in the back by the engine compartment. You would plug the cord from the engine heater into that rear 110-volt receptacle. If the generator would not start either, then you would need an extension cord from a shore power source and plug the engine heater into the extension cord. Now that you are home, you need to find that engine heater in the event you need it sometime. If you can't locate it, call Monaco Tech Support and they should be able to give you the location.
Glad you got home OK,
Rex 01 Diplomat