I guess you have a 2 way fridge, propane and 120 volts ac? Good thing it works on propane so you know the major expensive parts are functioning. As far as the 120 volt portion the first thing I would check is the heater. It will have 2 wires going to it and it is located close to the burner assembly, usually right above it somewhat encased in the metal and insulating wrap. Looks like a big glowplug. Get to the wire connection pull it apart and check the heater for continuity. My guess is it will be open, no continuity. Other than that there could be a problem with the cams and levers at the end of the changeover knob and shaft which actually energize the heater or the electric thermostat. The white cord which goes to nowhere could have been the feed for the heater, look into the burner flue and see if you see the heater, they slide into a ring welded onto the burner/coil assembly.
Chas
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