On my 2016 Vegas there are a couple of 12v circuit breakers with little yellow levers. There is one right by the battery bank (under the stairs in the 24.1) and another in the engine bay. Among everything else, it's good to check breakers to make sure they are not in a tripped state.
As with everything Thor, nothing is really labeled where it should be so there are various mystery wires and circuit breakers around that you have to try to map to something on a wiring diagram
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