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  • batteries-gctid808841

    might seem like a no brainer but,there are grunding cables in rear of engine to be attached to engine. I removed a couple to add another.I have the switch on up front to ALL because I have dual batterys.When I started putting cables back on,the one from the negative lead on one of the batterys,it threw a spark.I traced a lead from that negative post to the switch.Doesnt seem right for it to spark.Does anyone have a diagram of how dual batterys are supposed to be wired on a 1995 2452 Bayliner

  • #2
    When you say switch are you fearing to the MBSS? Only positive cables to the MBSS.

    This diagram has been posted many times, it's pretty much how your main battery cables and MBSS should be wired.

    Attached files

    Edmonds, WA
    "THE FIX" '93 2556
    Carbureted 383 Vortec-Bravo II
    The Rebuild Of My 2556
    My Misc. Projects


    • #3
      Likely the spark was the circuit closing. Perfectly normal, just not something you may not have noticed before. If the battery switch had been in the off position there would not have been a spark because the circuit would have remained open.
      P/C Pete
      Edmonds Yacht Club (Commodore 1993)
      1988 3818 "GLAUBEN”
      Hino EH700 175 Onan MDKD Genset
      MMSI 367770440


      • #4
        I agree with Pete. If the MBSS had been in the OFF position there should be no spark. If it was in the ON position you could get a spark. I just installed new house bank batteries and had the same thing happen. Turned the MBSS for the house bank off and had no problem.
        Just love being on my 3870............Bill
        1985 3870
        Twin 130 Mits. not turbo charged
        Name of boat is "Plenty Of Fish"
        Live on board full time.
        North Myrtle Beach, SC


        • #5
          it should be right,i have no spark when it is off


          • #6
            +1 to circuit closing. If you see actually shorting the + and - leads of the same battery together there would be a big spark. Still, be careful when you tray to attach the cables.

            Good luck.
            Retired, computer expert / executive
            Bayliner 285 Cruiser / Mercruiser QSD 4.2L 320 HP Diesel
            Live in the Bay Area, CA, USA, boat in Turkey
            D-Marin @ Turgutreis in Bodrum/Turkey
            [email protected]
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