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Old 10-11-2016, 06:26 AM   #4
sdowney717
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City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 2,185
I have been running my Delco 12SI alternators combined outputs for years with no troubles at all. It helps unload the alternator charging the 2 house batteries while the other loafs charging a single start battery. I put a continuous duty relay between the banks with a manual switch run off the fuel pump relay signaled from alternator the charges the single start battery.

I know it works as the amp gauge on one side falls, and the amp gauge on the other side rises when joined.

one time, I burnt a belt since one alternator was charging 2 house batteries putting out 60 AMPS and it was too loose. Letting both share the load is good idea, at least for ME. Whether it works for others, I can not say. Everyone has their own opinion about things.
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