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  1. J

    high voltage to just one battery but not the other (from alternator)

    Yep, makes sense. Thanks again for your help!
  2. J

    high voltage to just one battery but not the other (from alternator)

    Wet cell batteries. Does it make a difference? You don't like AGM ones? I am considering upgrading to AGM in the future.
  3. J

    high voltage to just one battery but not the other (from alternator)

    Problem solved!! Thanks dingbat for the tips! I connected the red wire (2) to the COM terminal on the switch and both batteries work fine now. Doesn't seem like the red wire (2) is a second charge line. If I disconnect it, I got nothing when I turn the engine key. My guess is that the red...
  4. J

    high voltage to just one battery but not the other (from alternator)

    Thanks Dingbat! What you said totally makes sense. I connected the 2 batteries exactly the same way as the diagram you shared. To complete the picture, I also added additional wires to the diagram below. There are 3 wires going in/out of the engine (starter/alternator), I labeled them in the...
  5. J

    high voltage to just one battery but not the other (from alternator)

    Thank you both for the great suggestions. I think I tried that already but still got the same problem. Let me try that again and remove accessory grounds to make sure. Thanks.
  6. J

    high voltage to just one battery but not the other (from alternator)

    Thanks for the reply. The battery neg's are connected together in the diagram, although it's connected through a common ground. Are you suggesting that the wiring should be done this way instead (see attached, scenario 3)?
  7. J

    high voltage to just one battery but not the other (from alternator)

    Hi, I have 2 batteries connecting to Honda BF225D outboard through a perko switch. When I use battery 1 to start the engine, everything was fine. When I switched to battery 2 to start the engine, the Honda ACG alert would beep continuously, indicating charging system is faulty. Use multimeter...
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