Originally Posted by dolphincraze
While towing our travel trailer does the fridge run off the battery of the truck or does the LP need to be on to keep it cold and running?
Your refrigerator may
run on 12 VDC, propane, or 110 VAC. Or it may run on propane, or 110 VAC only (even though, like the heater, 12 VDC is still required for the controls and fans), or, if it is a residential refrigerator, it will run only on 110 VAC (supplied by power pole or inverter).
If you look at the top front, you'll see a control panel. It will list the different methods of operation available and show, with an indicator lamp, which mode it is currently on.
There is a switch that allows you to manually choose which power source to use, or you can select automatic.
Additionally, any 12 VDC requirements are supplied by the camper, and not by the truck. Depending on your tow vehicle, your truck may not charge the camper battery at all. Fords generally have a charging circuit for the trailer, while GM products do not.
Generally speaking, if you have a propane capable fridge, that would be the preferred method of running the unit while on the road.
@TXiceman, my full size twin door Norcold is a three way. Of course, it was built in 1988...
@Jim, yes, it's ok to keep the fridge running on the road.
Hope this helps.