G23 Battery Charging Issue

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  • SVXTC
    • Feb 2010
    • 26

    • North Dakota

    • 2013 G23 2012 Super Air 230 2006 SV211 2005 SV211
    #1

    G23 Battery Charging Issue

    2013 G23 - 550HP - I had the battery selector switch go bad. Simple replacement. Ever since I have been having a charging issue with the batteries. The batteries just slowly drain down to nothing while using the boat. I pulled the alternator and had it tested. Tested perfect. I had the batteries tested and they were fine, but I bought another set of brand new batteries just in case. I test the batteries with a voltmeter with engine off 12.2V. Start the engine and voltage stays the same or slowly goes down. I tested the terminals on the back of the battery selector switch and pretty much same readings. I have tried "1" "2" and "1+2" switch position with no difference. Its like there is no voltage getting from the alternator to the battery switch or the batteries. Is there some sort of fuseable link or something in between the alternator and the switch? I'm just at a loss. Most charging systems are basic and apparently I'm missing something so I'm looking for some help guys !
    Last edited by SVXTC; 07-28-2015, 05:58 PM.
    Tags: None
  • SVXTC
    • Feb 2010
    • 26

    • North Dakota

    • 2013 G23 2012 Super Air 230 2006 SV211 2005 SV211
    #2
    Bueller, Bueller . Anyone? I know this has to be something simple and stupid, but I'm missing it. I have also tested voltage right off the stud on the alternator and its 18-24V. Is this a bad ground issue? The main grounds seems OK, are there any other grounds, switches, etc I need to check? Anyone have a wiring diagram for the G series yet? Begging for some help!
    Last edited by SVXTC; 08-05-2015, 05:43 PM.

    Comment

    • vision
      Senior Member of PLANETNAUTIQUE
      • Jul 2011
      • 517

      • NC

      • 2013 G23
      #3
      What is the current coming from the alternator at the switch end? It sounds like you tested your alternator. Assuming you have documented that there is good current being generated at the alternator when the engine is running, you must have a bad connection or current leak between the alternator and the batteries. Or, you have a huge load (i.e. many amps) drawing off the batteries, more than your alternator can match.

      Comment

      • SVXTC
        • Feb 2010
        • 26

        • North Dakota

        • 2013 G23 2012 Super Air 230 2006 SV211 2005 SV211
        #4
        There is a fuseable link in the wiring from the alternator. You need to be a contorsionist to get to it and much less find it plus its inside the jacket so its not plainly visible. Would have been nice to know that was there in a wiring diagram or something. Should be problem solved. Like I said, something simple, ugh!

        Comment

        • WinniSQ
          • Jul 2015
          • 11

          • New Hampshire

          • Centurion SV211
          #5
          Was going to say fuseable link. Had the same problem on my PCM powered Centurion a while back.

          Comment

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