12V at coil?
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Thread: 12V at coil?

  1. #1
    Member ldw72120's Avatar
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    Oct 2011
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    Central Arkansas
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    My TW has no spark. I replaced the coil, still no spark. Is the ignition wire going into the coil supposed to be 12V?

  2. #2
    Senior Member rm_hm's Avatar
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    Jul 2010
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    Near Narrows Bridges, WA State
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    What year is it?



    Ye olde manual for my late model calls for checking the following for no spark







    Check:

    1. spark plug

    2. ignition spark gap

    3. spark plug cap resistance

    4. ignition coil resistance

    5. pickup coil resistance

    6. source coil resistance

    7. main switch

    8. engine stop switch

    9. sidestand switch

    10.wiring (of the entire ignition system)





    Min.ignition spark gap

    6 mm (0.24 in)





    Spark plug cap resistance

    10 kΩ at 20 °C (68 °F)





    Primary coil resistance

    0.18 ~ 0.28 Ω at 20 °C (68 °F)





    Pickup coil resistance

    656 ~ 984 Ω at 20 °C (68 °F)

    (between white and red)





    Secondary coil resistance

    6.32 ~ 9.48 kΩ at 20 °C (68 °F)





    Source coil resistance

    624 ~ 936 Ω at 20 °C (68 °F)

    (between green and brown)


  3. #3
    Member ldw72120's Avatar
    Join Date
    Oct 2011
    Location
    Central Arkansas
    Posts
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    1994. I looked at the manual and it isn't 12V on the ignition wire at coil. I was going to jump 12V to the coil and see if it would crank.

    There is a test procedure in the manual but I was being lazy looking for an easy way to diagnose.

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