does it charge from shore power but not charging from generator
could be the main shore/genny TS
i ask because the inverter/charger also has its own pass-thru TS/relay
does the A/C work, that is one thing that is usually NOT on inverter
need to figure out which switch is stuck
or IF one circuit breaker on the generator has tripped and need to be reset
if generator power is not going to the inverter, there is no 120v to detect and it will stay in inverter mode
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s