Guys,

I am a little foggy with how Blackman wires the alternator
to the 2 battery banks...sorry to be long winded, but I can
use you info.

The battery box has 4 group 24 batteries all Interstate deep cycle...almost exact fit. 2 are for house and 2 for starting.

1.From my research on this board, Blackman doesn't have battery switch, just isolators so when the boat is running, it charges both batteries, but all the electrical uses the house banks correct?

2. What is that switch located near the battery box?

I replaced 2 of the 4 which I believe are house batteries (#1) but it's not doing too well for the amount of time I sit on the hook with the bait pump, lights and electronics running. I can't go 6v (works great on the Skippy) without going to a different box so I am thinking about adding 1 more to the house side and go with 1 group 24 starting battery....1k cranking, 800 cold. my questions are...

1. Is 1k/800 cold enough to crank the Volvo 41?
2. What happen if the starter battery die? Is there a switch to put all the batteries to the starter? Besides
jumper cable...
3. Does not having exact size (total load) batteries for house and starting affect or fool the alternator...like thinking the batteries are charged when in-fact, only the starting is charged?

Thank you in advance for any info guys...