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Thread: 85 k100rs low voltage/charged battery

  1. #1

    85 k100rs low voltage/charged battery

    Hey all. Been reading about all of the starter issues and wanted more info on ground running thru the starter. I have 11.25 volts on the battery and once in, will not even turn the headlight on. Acts like a drained battery. I read in a post that the ground is thru the starter and I need to pull it and clean it but should I be replacing anything (worn brushes?) before putting it all back in?

    Also because of this will I need to tap the relay?
    And will I do damage trying to jump from a car?

    thx

  2. #2
    3 Red Bricks
    Join Date
    Jan 2007
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    Pleasanton, Ca.
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    4,694
    11.25 volts is a bad battery.

    How many volts does it drop down to when you try to turn on the lights??


    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

    Lee Fulton Forum Moderator
    3 Marakesh Red K75Ss
    Mine, Hers, Spare

  3. #3
    [QUOTE=98lee;423637]11.25 volts is a bad battery.

    How many volts does it drop down to when you try to turn on the lights??


    It read 9.8. Is it a bad battery? Or a combination of crud in the starter/ cold /???

  4. #4
    Neilkamman
    Guest
    9.8 V is definitely a bad battery. Start by changing that out and see if problems go away. I have an 87 K75S and a new YUASA batt cured my cold-weather ills.

    Normal (I believe) is 12.8 cold, and 13.2 running on a functional alternator.

    There are good threads about this on K-Bikes.com.

  5. #5
    I have a 2yr old 12v BMW gel battery that has not had any problems till now. Have a battery tender and charge it monthly. Shouldn't it last longer?

  6. #6
    Registered User breyfogle's Avatar
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    Aug 2004
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    Lomita (aka L.A.), SoCal
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    703
    Quote Originally Posted by 117336 View Post
    I have a 2yr old 12v BMW gel battery that has not had any problems till now. Have a battery tender and charge it monthly. Shouldn't it last longer?
    BMW branded gel battaries do not have a strong reputation. A 2 year life is not unheard of. They also require a charger specifically designed for gel batteries. If you want reliability, get a new flooded lead acid battery (BMW/Mareg or other maker). If you want convenience, get any of several brands of AGM sealed batteries.
    '89 K75S Original Owner
    '94 (Beta) R11RS, ( RIP 12-5-2010 courtesy of blind left turning cage driver ) ....

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