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Thread: 85 K100 starting and alternator issues

  1. #1
    Registered User pjjj3386's Avatar
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    85 K100 starting and alternator issues

    My k100 has been giving me occasional starting problems. I will hit the starter, lights good, fuel pump going, but nothing from the starter. After 3 to 4 pushes, it starts and runs fine. And will usually start normally after that. And it is getting worse. Starter relay or the starter itself? Also the alt light has started glowing slightly. When I hit the brakes, it gets brighter. But it does not seem to affect the bikes running in any way. about 40k on the bike and other than that, runs great.

    Any thoughts or comments appreciated

  2. #2
    Registered User Paladinwest's Avatar
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    The fix for the glowing alternator light (assuming alternator is charging properly and no corrosion at connections) is here -> http://www.ibmwr.org/ktech/charge-light-glow.shtml
    2014 R1200GSA 33, 2008 HP2 Sport 10,000, 2008 R1200GSA 100,000 (Sold), 1990 R100GSPD 100,000, 1986 K100RS 152,000

  3. #3
    Mr Pea
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    Following others advice with a similar problem I first checked ground wires at the bell housing and under the tank, cleaned starter (ibmwr site has great description), and finally found it to be dirty internals in ignition switch (eastern beaver has instructions w/photos).

  4. #4
    '94 K75 heejrbmw's Avatar
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    Look at the thread listed below. I was having trouble with my K75. The charge light would glow dimly, and I received good help and advice here on the forum and the issue is gone/repaired. I did two things that were recommended, so I don't know which of the two fixed the problem, but doing both were worthwhile. My starter was very dirty inside. I made it look like new very quickly. I also cleaned the key switch, which had dirty-pitted contacts. The problems have been gone every since.

    See if anything here will help you.

    Ed

    http://forums.bmwmoa.org/showthread....ge-light-issue
    Ed Evans - - Semper Fi
    '94 K75 '92 K75S
    "Always do more than expected." Coach Jerry Moore, ASU

  5. #5
    IBA #44567 Ken F's Avatar
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    First, I would try going to Radio Shack or a music store and by some DeoxIT.
    Clean all connections under the tank,ground, and the connector for the EFI unit, and the Ignition sensor.
    Your bike will love you for it!

    Ken
    IBA #44567 Pres. Springfield BMW Roadriders
    "Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."
    -Albert Eienstein

  6. #6
    3 Red Bricks
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    Your problem is either a dirty ignition switch (internally) or dirty starter commutator.

    Try testing the voltage at the fuse as explained in the thread Ed referenced.



    LONG MAY YOUR BRICK FLY!

    Ride Safe, Ride Far, Ride Often

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

  7. #7
    Registered User pjjj3386's Avatar
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    Thanks for all the info! Going to remove & clean starter today.

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