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Thread: 99R1100RT starting electrical gremlins

  1. #1

    99R1100RT starting electrical gremlins

    Iíd appreciate your help troubleshooting.

    Bike has ~80k miles with the last ~10k mine.

    Battery (approx 2 years old) kept getting weak but it would strong up on the battery tender. Iíd hear the squeaks of the alternator belt on starting. So early this past week I changed the alternator belt. Didnít help so I replaced the battery, too. (Yay Beemer Boneyard)

    Ran great for the rest of the week local to build trust. Then took it a couple hours away on Thursday for a little trip. Super! Good stops and starts. But then this AM weak battery no start. Dash lights strong and the fan for the LED headlight string. I was far from my battery tender so I bump started it and got home. Tried to start after all that alternator charging and the starter motor engages but no crank.

    Voltage on the battery when sitting is 12.3. When the starter is attempted voltage drops to 6 V.

    Reckon bad starter wiring / connectors or starter itself?

    Thanks for your collective wisdom.


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  2. #2
    I should say previous owner reportedly changed Hall sensor. And I believe it since it was well maintained and itís only a start problem.


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  3. #3
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Quote Originally Posted by khfranck View Post
    Iíd appreciate your help troubleshooting.

    Bike has ~80k miles with the last ~10k mine.

    Battery (approx 2 years old) kept getting weak but it would strong up on the battery tender. Iíd hear the squeaks of the alternator belt on starting. So early this past week I changed the alternator belt. Didnít help so I replaced the battery, too. (Yay Beemer Boneyard)

    Ran great for the rest of the week local to build trust. Then took it a couple hours away on Thursday for a little trip. Super! Good stops and starts. But then this AM weak battery no start. Dash lights strong and the fan for the LED headlight string. I was far from my battery tender so I bump started it and got home. Tried to start after all that alternator charging and the starter motor engages but no crank.

    Voltage on the battery when sitting is 12.3. When the starter is attempted voltage drops to 6 V.

    Reckon bad starter wiring / connectors or starter itself?

    Thanks for your collective wisdom.


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    Sounds like itís time for a battery. Voltage dropping below around 9.2 volts while cranking is a no-start condition.
    You can verify this by jumping the bike as you would a car. The Battery Tender wonít do it and it isnít good and may ruin the BT.
    OM
    "You can do good or you can do well. Sooner or later they make you choose". MI5
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    2009 F800GS 1994 TW200

  4. #4
    #13338 PGlaves's Avatar
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    I suspect starter drag - either because the nose bushing is worn or because a magnet has come loose. Does attempting to start the bike cause an ABS fault?

    With a fully charged battery what is the voltage key off?

    What is the voltage key on?

    What is the voltage with the starter cranking or otherwise with the start button depressed?
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  5. #5
    Voltage key on 12.3. Starter engaged 6 something. New battery this week.


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  6. #6
    #13338 PGlaves's Avatar
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    Quote Originally Posted by khfranck View Post
    Voltage key on 12.3. Starter engaged 6 something. New battery this week.


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    You almost certainly have a defective starter. If it was a bad connection it would not pull the voltage down that far. I suspect a loose magnet.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  7. #7
    Self-fixable or back to the Boneyard??


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  8. #8
    #13338 PGlaves's Avatar
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    Quote Originally Posted by khfranck View Post
    Self-fixable or back to the Boneyard??


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    It will be a good idea to verify the defect.

    See: https://www.youtube.com/watch?v=NSTfZaEERCc

    Remove starter and take the back plate off. You will probably find one of the three magnets loose from the case and stuck to the armature.

    If so get a new starter. If not check the nose bearing for wear.
    Paul Glaves - "Big Bend", Texas U.S.A
    "The greatest challenge to any thinker is stating the problem in a way that will allow a solution." - Bertrand Russell
    http://web.bigbend.net/~glaves/

  9. #9
    Great video. Tested it like the video and the starter failed. New one on order!!




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  10. #10

    99R1100RT starting electrical gremlins

    New starter solved the problem. I didnít know R1100s could sound so eager!


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  11. #11
    Fortis Fortuna Adiuvat Omega Man's Avatar
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    Nice.
    OM
    "You can do good or you can do well. Sooner or later they make you choose". MI5
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    2009 F800GS 1994 TW200

  12. #12
    MOA #24991 Pauls1150's Avatar
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    Great!
    That "squeak" during starting may not have been the alternator belt - it's also a sign that the inside of the starter's nose is dry and/or dirty.

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