If as you said some things work and others don't there is an issue with one or more breakers in the panel or the circuit itself.
You said the refrig switches from LPG to elec when the gen is running so power is getting to the coach. The same holds true for the TVs unless they are running off 12V and an inverter. The interior lights will be 12V so they are running off the house batteries.
If you haven't done so contact Thor and ask them for the 120V electrical diagram for you coach.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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