alternator charging issue

87 AJ 270

New Member
Nov 6, 2010
5
fl
Boat Info
270 SeaRay, Amberjack, i customized for diving, fishing, and entertaining, Garmin GPS combo, twin 17
Engines
twin 175-V6 gas hogs
Does anyone know what alternator came on a 1987 V6 175 Mercruiser? Alternator make and amp output? I've got twin v6's charging 3 batteries, 1 engine charging 1 battery and the other engine charging 2 batteries. The 2 battery bank is getting a high charging rate. i'm wanting to add a battery isolator to help save the alternator from trying to charge both batteries at the same time. I've got a Sure Power isolator but I have to know what alternator I have to make sure they will work together.
Any other ideas would be appreciated.
 

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