js550 battery dead overnight
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  1. #1
    PWCToday Newbie
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    Sep 2017
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    Indiana
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    js550 battery dead overnight

    I rebuilt the motor. I found a broken wire on the charge coil so I replaced that. Put the ski back together and it fires up and runs well. The problem is it's sucking charge out of the battery even when it's not running. I put a brand new battery in yesterday with a full charge and this morning it had less than a volt in it. While running I checked and it didn't seem to be charging. There's continuity to the coil on the light green wires. Voltage regulator? Gremlin? Both?

    Any help greatly appreciated.

  2. #2
    PWCToday.com Is My Home Away From Home hyosung's Avatar
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    Re: js550 battery dead overnight

    you are on the right track , if i was an expert on 550s i would guess the rectifier is shot as well ,
    "OR" you got a dud battery ......
    a couple of simple tests with an OHM meter withe the rectifier disconnected will determine if that is your issue.
    Last edited by hyosung; 05-12-2018 at 12:24 PM.
    http://www.pwctoday.com/showthread.php?t=425767

    modded X2 650

    900 powered custom 650 sx .

    Jerry Rigging is my specialty .....



    if i did like everyone else and copied everything i needed or wanted i would save lots of time and money.

  3. #3
    PWCToday Newbie
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    Re: js550 battery dead overnight

    I wish I were a 550 expert too.

    I started it with my sxi battery the night before and it did the same thing. Dead battery. So now I have two dead batteries and I'm not having much luck getting a charge back in either.

  4. #4
    I dream skis
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    Re: js550 battery dead overnight

    Replace the voltage regulator rectifier. It sound like its letting the current flow back to the coil. If someone ever hooked the battery up backwards (only for a minite) it's toast.
    eric

  5. #5
    Top Dog Bionic racing's Avatar
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    Aug 2016
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    Idaho/California
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    1,211

    Re: js550 battery dead overnight

    Check for a drain , something , is on , aka bad diodes , use a test light .
    This applies to all vehicles water or land
    Disconnect negative cable from good battery
    Run 12v test light in series with cable and battery post
    If there is a drain or short the light will come on
    If not then you dynamically test charge system ( running )
    That 550 will show 13.2 or so @ 3000 rpm
    If not then your charge coil on stator is bad
    Ohm stator
    Always load check battery when fully charged to verify good
    Leave battery disconnected from ski overnight to see if battery itself is bad
    Shorted cell will drain a battery flat overnight internally
    Good luck

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