Originally Posted by BriEOD
Nice thread Diesel. Very detailed. My only concern is what effect will this cause on your alternator. I'm not an EE, but what do you think is the minimum amperage alternator you could safely use with this? Obviously, by putting the batteries in parallel you are charging both simultaneously and you have doubled the demand on the alternator.
If I am correct, the relay solves this problem.. as the relay charges both the batteries evenly.. and in theory its just one large battery.
I did not know the Borg piece was available.. and ended up buying a 60 amp (rated) Isolator from Napa.. it works great. If I was to do it all over again, I would probably just use the Borg piece.. Tho finding the Acc wire on older boats that aren't MC's might be a pain..