[Carl n Susan]

It helps greatly if you tell us about the year and model of your Montana. You say you have a Samsung, so I know you have a residential refrigerator. I personally have a RV refer so I am not all-knowing about the residential models. But from reading posts here, there is an inverter that powers your refer.

The Inverter is usually located in the pass thru compartment near the drivers side on the ceiling. The inverter should have a 120V AC power feed and a 12V DC power feed. When 120V is present the inverter passes the current onto the refer via the plug from it into the inverter. If no 120V is present, then the inverter, which may have to be turned on depending on the model, automatically will use 12V battery power to produce 120V AC to feed the refer plug.

You need to find the inverter and verify it has 120V AC power, 12V power, and that the refer is plugged into it. If that doesn't help, let us know.