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Negative terminal smoking

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  • Negative terminal smoking

    Hi, I am posting this on behalf of my boyfriend and we are both fairly inexperienced with boat mechanics. We tried to start the boat up for the first time since the winter and are having issues. When turnin the key power is being received by the stero, fish finder, leg lifts but it won't turn over or start. Also the negative on the battery gets really hot and begins to smoke/ spark. We have cleaned the battery posts, terminals etc and no luck. Not sure what to try next as we have googled the problem and seems like there could be many seperate issues causing the problem. Can anyone suggest what we could check next to narrow it down or anyone have had this issue themselves? Thanks in advance.

  • #2
    Re: Negative terminal smoking

    #1, make absoutly shure you do not have the battery hooked up backwards- neg to positive post. It has to be positive to pos,neg to neg.
    #2 check both ends of all cables for corrosion,even right where the neg hooks to the block,hard to get to on some but needs to be checked.
    If it got that hot it needs to be replaced,it overheats the wire and causes more resistance,not good.
    Let us know how it goes!
    Grub
    Also how about a pic of the battery/motor where the problem is,and model serial numbers!
    Last edited by Grub54891; May 5th, 2013, 05:21 PM. Reason: Added text.
    If ya can't fix it with a hammer,ya got yourself an electrical problem.

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    • #3
      Re: Negative terminal smoking

      Originally posted by grub1grub2 View Post
      #1, make absoutly shure you do not have the battery hooked up backwards- neg to positive post. It has to be positive to pos,neg to neg.
      #2 check both ends of all cables for corrosion,even right where the neg hooks to the block,hard to get to on some but needs to be checked.
      If it got that hot it needs to be replaced,it overheats the wire and causes more resistance,not good.
      Let us know how it goes!
      Grub
      Also how about a pic of the battery/motor where the problem is,and model serial numbers!
      And along with this if you have wing nuts replace them with nuts.
      don't claim to know it all just hear to help.

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      • #4
        Re: Negative terminal smoking

        The battery is hooked up correctly, we've tripled checked that because that's what we first thought it was. I've also cleaned and sanded where the positive and negative enter the engine. Again there's power and a humming coming from the engine but when I turn the key to start the engine there is a loud "click" then nothing. Turn the key back to remove it and a constant beep begins. Have to disconnect and reconnect the battery for another attempt.

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        • #5
          Re: Negative terminal smoking

          Here are a couple photos of the engine, hope they can help!
          Attached Files

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          • #6
            Re: Negative terminal smoking

            Remove the starter and have it tested.
            If ya can't fix it with a hammer,ya got yourself an electrical problem.

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            • #7
              Re: Negative terminal smoking

              We are going to try to get the starter out today and I will let it know. Thanks!

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              • #8
                Re: Negative terminal smoking

                If the starter needs to be replaced, don't buy an "automotive" starter, buy a "marine" starter (ignition protected). A marine starter will cost 2-3 times as much compared to an automotive starter, but worth it for safety concerns.
                2001 Crestliner SuperHawk 1800, Mercruiser 140HP
                2007 Tracker 1436 jon boat, 7.5HP Force

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                • #9
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                  Re: Negative terminal smoking

                  Or.....If the starter is bad...Have it rebuilt by a starter/Alt shop. Much cheaper and you know it's the right one
                  1986 21' Celebrity BR - 350 Mercrusier I/O 260 H.P....Engine Serial #B427596
                  1981 18' Checkmate Eluder - Original 898 I/O engine....Replacement engine 1979-350....Serial#-Unknown
                  Current..... Completed Restoration....Now on the water!
                  1999 GTX Sea-Doo

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