Re: How does my charge pro work?
Yes, it works via shore power and an on-off switch, probably on a breaker panel inside the cabin. It'll be labeled 'charger'.
Hopefully, your charger is a dual bank type that's hard-wired to, and charges both batts at once. There should be some indication on the charger itself- for example, a 2-bank, 20-amp charger will supply 10 amps per bank (battery) to 2 batteries at the same time. If it is that type, you don't need to use the battery selector switch. You can leave it set in any position, including 'off'. If it's a single bank charger, you'll typically direct the charge to the battery you want (or both batts at the same time) via the battery selector switch.
Hope that helps.