I have twin Cummins 6CTA 8.3 motors with 150A alternators. I purchased 2 ArgoFET battery isolators to recharge the house bank from the alternators. I purchased the 1 input, 3 output battery isolators (starboard engine starting bank, port engine starting bank, house bank) however I think I only needed the 1 input, 2 output battery isolator.
It seems simpler to have the starboard alternator recharge the starboard starting battery and the house battery, and the port alternator recharge the port starting battery and house.
Can I leave an output on the battery isolator unused with a rubber cap on it? Or are they designed to require being wired to a battery?
