Which side of coil is positive?

Discussion in 'Electrical' started by fpd4308, May 12, 2010.

  1. fpd4308

    fpd4308 Member

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    I was wondering which side of the stock harley coil is positive as neither post is marked. I have heard that as long as you put all the positive wires on one post and the grounds on the other it doesnt matter but wanted to check with the experts.

    Thanks
     
  2. BUBBIE

    BUBBIE Well-Known Member

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    If post are color like gold copper brass = positive... While silver is usually negative..

    Signed....BUBBIE
     
  3. Hoople

    Hoople Account Removed

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    It does make a difference. Reversing the polarity on the primary side changes whether the spark will jump from the shell electrode to the center post tip or from the center post tip to the shell electrode. It is always preferred to have the spark jump from the hotter electrode to the colder hence center to shell.

    Reversing the polarity will not prevent the bike from running. It will just require more ionization voltage to jump the gap.
     
  4. glider

    glider Veteran Member

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    You can check the polarization of the spark by using a lead pencil point inserted between the plug wire brass and the spark plug tip. See which way the spark arks. If it arks to the plug you are wired correctly.
     
  5. Safehaven

    Safehaven Active Member

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    Hoople already gave the answer that the polarity of the coil will direct which direction the plasma arc will be initiated from (cathode or anode). Since the center pin will generally run a bit hotter, it will be a bit easier to initiate the spark, but your bike will run either way. The difference is marginal..
     
  6. ultrat

    ultrat Senior Member Contributor

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    I must be dense,, i read Gliders post several times,, then i got it...
     
  7. fpd4308

    fpd4308 Member

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    Awesome..thank you all for the help.