Thanks for the advice Richard. However I am committed to a different but somewhat similar approach. I will switch to just one start battery and that will be charged by the regular alternator (55 amp) on one of the engines. I have purchased a Balmar 110 amp alternator and Balmar 3-stage regulator for the other engine and they will be dedicated to the house bank, so I will be charging the house bank when out running. In addition to the regular alternator I have a 20 amp 3-stage charger that is dedicated to the start bank, so it will be charging the start bank when on shore power and when the genny is running. And the Freedom 25 invertor/charger will charge the house bank when on shore power or the genny. I will keep the house and start banks completely separate, but if the start battery should die out on the water I can start the generator (with its own battery) to charge the start battery via the start battery charger or use heavy duty cables to jump from the house bank to the start battery. I think it should all work out. Thanks again. Alan Shapiro "Alan, consider a reconfig of your high amp system like this: Both of your alternators charging house bank, rewire one of your start bank as part of the house bank (still only one house bank but larger, start your engines one at a time from one start bank (same one you have), install a (10A) black box smart charger for your start bank, run your amp meter(s) from a shunt"