Going back to the 1970's...the motorhome engine running will charge both chassis and house batteries.
"If" your house batteries only were charged when you plugged in to shore power..you would really be disappointed....would be a real PITA
now..only recently does shore power charge the chassis battery on certain model motorhomes.
But..do the test.. check battery voltage unplugged..then checked plugged in..12.7 or so unplugged charged to 13.5 to 14.7 plugged in.
The bigger issue is the Converter..will converter cook your batteries.(overcharging)
when shore power is left plugged in for extended amount of time and boil the batteries dry..then you have to buy new ones..
maybe..the previous owner put some sort of battery minder that will prevent overcharging.. having a good volt meter will eliminate all the mystery....
Learning all your systems on your R.V. has to be one of your first things to do so you don't accidentally damage your many systems.
welcome to the adventure of r.v.ing.
