[Russf]

I suggest that you re read your email and be clear about the symptoms. Your post says the new alternator burned out. Is that correct? You also talk about port engines! Also you might report on what the starboard engine volts are. On my boat the port engine charges the house bank. Also what do the panel voltage gauges show? Put a matter on each battery and see if the voltages agree with the meters. I have been through some alternator issues and know how important it is to assemble as much troubleshooting data as possible. With the limited and ambiguous information you provided I doubt that you will get any good feedback.