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Thread: battery

  1. #1
    brad148405's Avatar
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    battery

    I bought a new AGM battery, had use prior weekend, just charged it last night on 2 amp slow charge put the battery back into the ski and nothing will power on or kick over, all I hear is my bilge pump running, is there something I need to do? my MFD wont even come on... no spark or crank from the engine as well.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Reversed battery polarity?

    BTW, 2 Amps is not really a slow charge on a 19 Amp-Hour PWC battery, it is a medium-fast charge.

    Why would you need to re-charge a new AGM battery that you were riding with only a week ago?

  3. #3
    brad148405's Avatar
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    got the dreaded red light on MFD and it stayed on it for about a week, I figured it was dead.. or on its way... I just charged it up. Hmm... I did go out early and put the battery on, let me check to see if messed up this morning... lol

  4. #4
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Question on agm

    My charger has settings for regular 12v, deepcycle, agm, and 6 volt batteries.
    Can a regular charger be used on a agm battery?
    Last edited by starflight; 08-30-2008 at 08:36 AM.

  5. #5
    brad148405's Avatar
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    yep I reversed them... lol, now my new problem, try and fire it up... nothing.. just clicking coming from eletrical box...

  6. #6
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    What voltage do you measure from the battery now?
    Does the mfd show a display now?

  7. #7
    brad148405's Avatar
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    yes MFD displays, havent volted it out yet... already replaced starter and bendix so we can rule that out, new battery charged 100 percent over night. it just turend over a few days ago...

  8. #8
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    For shits and grins, I'd check volts again.

  9. #9
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    its reading 4.96.... damnit... new battery too.... img etting so frustrated with this damn ski, Im getting ready to take my ak-47 to it!!! I guess I will have to throw it back on the charge, I only let it charge 45 mins last night, it reached 100 percent, fast.

  10. #10
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by brad148405 View Post
    its reading 4.96.... dammit... new battery too....
    I guess I will have to throw it back on the charge, I only let it charge 45 mins last night, it reached 100 percent, fast.
    11.80 volts is considered fully discharged for a battery. Lower than that is excessively discharged.

    Reverse polarity can have several effects.

    The battery may have drained very quickly through the stator charging coil and LR regulator.

    The Stator coil and/or LR voltage regulator may have been damaged by the reverse polarity. Check resistance between Yellow and Red/Purple wires (disconnected from the terminal board), and check for shorts from Yellow to engine ground.

    When recharging that excessively discharged battery, set the charger for a non-smart charge mode, 2 Amps or less, and let it charge for a while. When excessively discharged, a battery can falsely appear to the charger as being fully charged. A slow recharge rate will 'push' the battery until it starts accepting a charge properly. After a few hours, you should be able to switch to 'smart' charging (AGM mode on the charger), and finish the recharge.

    Excessive discharge can internally damage the battery. Your battery is probably never going to be as strong as it was, and it may now be weak, even after a full recharge.

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