Author Massive parasitic battery draw. Help!!  (Read 1193 times)

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  • Offline Edgey   gb

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    Offline Edgey

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    Massive parasitic battery draw. Help!!
    on: 02 September, 2022, 04:09:19 pm
    02 September, 2022, 04:09:19 pm
    So, after my 'battery failure' 2 weeks ago. I found no parasitic draw and R&R putting 14+v out. Fitted new battery . Problem has returned giving me flat battery. I carried out the following (please bear with me chaps) ...

    After fully charging my new batt with a batt maintainer (with new batt on the bike). Removed charger last night and this morning it wouldn't crank , my new battery was at  11.2 volts .  With my limited auto-electrics skills,  using multimeter,  i disconnected neg batt lead and bridged with multimeter and it showed a massive 8amp parasitic draw (despite no such thing when I checked same last week). Pulling and refitting each fuse one at a time to identify circuit  made no difference to current draw. Removed all fuses completely and still 8amp draw. Only way to stop the draw was to pull the starter solenoid fuse (30amp).

     Refitted all fuses, put spare batt on, fired up, it's  putting 14.2 volts to battery. Removed neg lead again and checked draw,  still 8amps . Connected up,  would not crank....not even a click from solenoid.....after a few 'presses ' of starter button, it cranked & fired. Removed neg lead again and.......no draw!. Connected up, fired up, checked draw again....zero. went through whole routine again.....8amp draw returned. Giving up for today.

    Obviously an intermittent  fault causing tge 8amp draw but headache where to start without chucking solenoid and starter at it ( after I check all cables & connections of course). Any thoughts/ideas guys🙆‍♂️

  • Offline concours

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    Offline concours

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    Re: Massive parasitic battery draw. Help!!
    Reply #1 on: 25 November, 2022, 02:33:29 am
    25 November, 2022, 02:33:29 am
    Replace the starter relay.
    You gotta' twist it to get it to howl...

  • Offline ZuluTiger   us

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    Offline ZuluTiger

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    Re: Massive parasitic battery draw. Help!!
    Reply #2 on: 25 November, 2022, 11:04:57 pm
    25 November, 2022, 11:04:57 pm
    Or you have a stator winding shorted to earth / ground.

  • Offline Mike_B   gb

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    Offline Mike_B

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    Re: Massive parasitic battery draw. Help!!
    Reply #3 on: 26 November, 2022, 09:20:39 am
    26 November, 2022, 09:20:39 am
    If pulling the starter solenoid fuse stops the current draw, then surely thatís the place to start looking?  Especially as it seems a bit random whether the bike tries to start or not.  Solenoids are £40. Itís a bit of a gamble - but equally it isnít a wild guess at a random part.

  • Offline Sidewinder   gb

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    Offline Sidewinder

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    Re: Massive parasitic battery draw. Help!!
    Reply #4 on: 26 November, 2022, 11:19:11 am
    26 November, 2022, 11:19:11 am
    You're getting 8amp draw ignition off?

    When you encounter the draw, tried disconnecting the stator cable to see if it stops the draw?  I would also try disconnecting the RR cable to the battery.

  • Offline indytiger1050   us

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    Offline indytiger1050

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    Re: Massive parasitic battery draw. Help!!
    Reply #5 on: 26 November, 2022, 04:32:48 pm
    26 November, 2022, 04:32:48 pm
    *Originally Posted by concours [+]
    Replace the starter relay.
    :462:

    Only thing that makes sense.    Might be a good time, pull the negative cable off battery, trace to frame. Clean the wire tab both sides, the frame shiny contact point.  Pull power cable off starter.
    Would be curious to see amp draw with all pulled but relay.  Amp draw without starter connected and with.   
    Support the forum.   :031:

     



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