It looks like my charger is only wired to the 2 batteries under the seat. The 2 house batteries are in the bilge and I cannot find any wires from the charger. Does that seem correct? If so, I am only charging the house bank while running the boat?That was not the case for me. The two in the bilge were wired in parallel and were the house batteries running all the 12v loads on the boat and started the port engine. The batteries under the seat one was wired to the starboard engine the other was for the generator.
I suspect yours are wired the same.