New Battery Not Holding A Charge

Discussion in 'Electrical' started by Shelby6t7, Mar 18, 2010.

  1. Shelby6t7

    Shelby6t7 Member

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    My 2002 Fatboy had the regulator & battery replaced less than 2 years ago.Ever since the battery does not hold a charge even after being charged on a battery tender and ridin for a while. I haven't even been activating the factory alarm? Any theories?
    [​IMG]
     
  2. TQuentin1

    TQuentin1 Well-Known Member Staff Member Moderator

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    Do the bleed-back test to make sure that the VR is not shot.

    Testing The Charging System - Harley Davidson Community

    TQ
     
  3. Chopper

    Chopper Senior Member

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    You can also do a Milliampere Draw Test
    NOTE
    Be sure accessories are not wired so they stay on at all
    times. This condition could drain battery completely if vehicle
    is parked for a long time. Check for this by connecting ammeter
    between negative battery terminal and battery.

    1. Connect ammeter between negative
    battery terminal and battery. With this arrangement, you
    will also pick up any regulator drain.
    2. With ignition key switch turned to OFF and all lights and
    accessories off, observe amperage reading.
    a. Add regulator draw to appropriate
    value for TSM/TSSM/ECM. If sum is less than reading
    observed on ammeter, draw is within limits.
    b. A higher reading indicates excessive current draw.
    Any accessories must be considered and checked
    for excessive drain.

    NOTE
    A battery with a surface discharge condition could suffer a
    static drain. Correct by cleaning battery case.

    Milliampere Draw Test
    ITEM MILLIAMPERES DRAW
    Regulator 0.5
    TSM (non security models) 0.5
    TSSM (disarmed) 0.5
    TSSM (armed) 3.0
    ECM (EFI models) 1.0
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    Also check to see that the regulator is grounded, connect a test light to the pos. on the battery and touch he regulator and the frame it bolts to, if the test light lights up you have a ground, Jack
     
  5. Shelby6t7

    Shelby6t7 Member

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    Thanks for the advise will check it out. appreciate it!
    [​IMG]
     
    Last edited by a moderator: Mar 20, 2010