2000 Tiara 3500 Open- 6bta Cummins

[trit21]

I was wondering if someone that either has this boat with same power package or Brian (Tiara CR) woud happen to know what alternator came with this boat and power package, 3500 Open with 6bta 370 Cummins. Have a problem that I think is the alternator where my alternator regulator show errors. Error is 1) can't turn off field 2) battery volts disconnected. Not sure what they mean but when I connect the field wire from the alternator regulator to the alternator, get those errors and the battery voltage spikes to over 16 volts. I disconnect the field, of course that alternator will not charge but I turn on the emergency crossover and the other engines alternator charges both battery banks with no problem. So I think it is the alternator. Will try and rebuild but also want to buy a new(refurb) and have a spare as well. Thanks.