[DutchmenSport]

My first thought was the same as MandK (above). It sounds like your inverter was not turned on.

Possible causes: The on-off button on the inverter itself might have accidently been pushed, or something bumped it which turned it off. Next, there is a red cut-off switch that runs between your house batteries and the inverter. If this cut-off switch is in the "off" position, then the inverter is turned off. Third possibility: The batteries themselves might be low, not charged, and the low battery turned off the inverter. Check this simple possibility first. If the light is out, there is no electricity going to the refrigerator. (Of course .... the refrigerator has to be turned "on" also)

If the inverter checks out OK, and if you plug into shore power and the refrigerator light comes back on, but when you unplug the camper, the light goes out again, the next thing to check will be the "transfer switch". There is a transfer switch that control the "source" of the electricity that is diverted to the refrigerator.

The transfer switch detects shore power when the trailer is plugged into electricity. The transfer switch detects when shore power is cut off (camper unplugged). When that happens, the transfer switch, switches the source from shore power to the inverter out-put (AC).

Remember, in order for the inverter to work (not plugged into shore power), the power starts with the battery (12 volt DC). It passed through a cut off switch. It then goes into the Inverter. The inverter must be turned on. The inverter changes the 12 volt DC power to 120 volt AC power. The AC power now leaves the inverter and travels to the transfer switch. If the camper is not plugged into shore power, the transfer switch will pass the AC power to the breaker panel and from there, it will go to your refrigerator.

So, the breakdown could happen anywhere along that path. The simplest to start is with the on-off button on the inverter and the cut-off switch from the battery to the inverter. Note: you actually have 2 cut off switches..... one for the inverter, and a second one for the camper "house". They are wired separate.

Good luck, and I wish you success in finding a very simple solution.