It could be as simple as a blown fuse at the fridge. Also check to make sure you have turned on the electric switch that allows the fridge to run on AC. Note, you can only operate the fridge on EITHER gas OR electric, but not both sources at the same time, thus, you have to turn off the gas switch before you can run on electric.
When this unit is running on electricity, it has to have the thermostat set for it to run.
Here's a link to the Dometic manual for your model.
http://www.alcovr.com/DATA/MANUEL/DometicRefrigeratorModelsRM2191&RM2193.pdf
Just follow the steps for running on electric and you should be OK.
Hope this helps.
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