Originally Posted by EvilRabbit
1 House bank with 6 x 220ah
2 engines, 2 alternators, 2 starter batteries and 2 Cyrix relays
so you have 3 banks. wire a cyrix between each of the start batteries and the house bank. you need 2
ideally the alternators are rewired to the house bank. then the cyrix won't carry much current
to the start batteries and size is less of an issue.
if you wire to engine
batteries then the cyrix need to carry 120+ amps as most of the alt current will flow through it to house battery.
fuse alt circuits and cyrix circuits near batteries.