Hi !
Welcome to IRV2! We're sure glad you joined the gang!
I believe that on most RV's the alternator only charges the chassis batteries, not the house batteries. You would need to have it connected to shore power to charge the house batteries.
Good luck, happy trails, and God bless!
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Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD