Help, I have a 2010 tiara 36 open with Volvo Penta D6 370 engines and IPS drives, the alternator on the starboard engine has an extra alternator 3803911 the alternator has 4 lugs ( B+, B- , O , W ) on it. There are only 3 wires that go to the alternator B+ to the battery, B- to the ground and a small black wire. does the small black wire go to O or W and what goes on the other lug? there was a small red wire on the old alternator but it had rusted completely off and I’m not sure where it would have gone (maybe a jumper wire). Any help would be great.
Tried to find wiring diadram but had not luck.