Those old Dometic's used a pretty simple system for the 120 volt side. The power comes in, goes through a thermostat which only serves the 120 volt system (a second one is used for the gas side) and then through a toggle switch which is activated when the knob is turned from gas to electric. A mechanical lever turns the gas valve to off, and that pushes a knob on the valve to turn the electric on. You can see how it works pretty easily from the back access port for the refrigerator.
I would look to see that the mechanical arrangement to lock the electric off when the gas is on and vice versa is working, confirm power at that switch too. If all that is good, the only other part is the 120 volt thermostat.
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