Originally Posted by mrfuni
Thanks guys, I'm new at this and we are preparing our first trip and my wife asked the question. Back to the manuals.
Yep. Check your fridge manual. If set on auto, it will select the appropriate power source.
In the 70C, mine runs on 110v shore power/or generator if it's available, defaults to 12v when the engine is running. It switches to propane if there is no 110v or 12v power. Mine will not stay on 12v with the engine off to prevent running down the house battery.
Also, it will help if you can plug your RV into shore power before you start packing for your trip, that will get the fridge cold before you start loading food, you can also run the rooftop AC to keep the coach cool, too