hi, thanks for trying to make sense out of this. The lower two batteries are physically separated from the upper two. I am pretty sure the lower 2 are the start batteries, are in parallel, and have the red connected to what I am calling an AC via a 3d lug in its back.
The upper 2 batteries which I think are the house batteries, each have a red connected to the ACR. These 2 batteries do not connect to each other directly.
The old charger has 2 orange and a brown. The label says "orange to battery, but thee are 2 orange. One goes to the start selector switch, the other gets lost
behind a panel. I will have to see where that goes. I have not taken the chage apat as its back seems to be "pressed" in place. I am thinking that when I remove the charger But I see what you mean about 2 wires coming from " someplace" that maybe just taping them off is not such a good idea.
Finally, I traced the red cable to the starter rather than the alternator
, but you may be right. I assumed the heavy red would go to the starter or solenoid and the alternator would just be a smaller wire back to the batteries. (please stop laughing)
You actually have answered some questions I have. esp whether the charger controls one or two banks. I think, now , that I just need a charge controller that I can hook directly to one of the batteries in the house bank ( the upper set)
There is no label on the ACR (I think it is an ACR) but I will take another look with a better light. It looks like an ACR that I saw in one of my searches, but as you say, they usually have just 2 lugs. This one definitely has a 3d lug in back connecting to the lower battery bank.
So, thank you for taking the time to respond. I'll tr to post what happens.