Shore power & coach battery question
I am new to Rialta's, but the Itasca Spirit (same as winnie warrior)
built on a toyota chassis does. On that one, when you in introduce 120v ac, the cabin battery is isolated, the converter operates providing 12v dc in the cabin & charges the cabin battery.
How to verify? with engine off, turn on interior lights (or better yet, apply voltmeter to a 12v dc destination, like a cigarette lighter in the back (not on the dash) or remove a bulb and test there) and introduce 120v ac - plug in or start generator. The lights should get brighter.
A 12 volt batter should test at 12.5v dc. With power being applied - like the battery charger it should go a bit higher.
On the Spirit, when the engine runs, it charges both batteries & the lights also get brighter.