Re: Ignition coil polarity question?

Posted by Dave Wickman on April 18, 2000 at 11:10:26 from (192.43.65.245):

In Reply to: Ignition coil polarity question? posted by Mr. B~MI on April 18, 2000 at 09:25:49:

Mr. B,
Here is the best way I can tell you and this information is from a John Deere FOS (Fundamentals Of Service) manual.
Wrong polarity of the coil is not a serious problem, but can cause damage over a long period of time. A coil that is wrongly connected to the power source and the distributor will require an extra 4000 to 8000 volts to create the spark.
Voltage in the secondary winding may go as high as 20,000 volts. However, it will only go as high as needed to cause the current to jump the spark plug gap.
The wrong coil polarity makes the center electrode of the spark plugs have the wrong polarity. This can cause misfiring as the voltage required to jump the spark gap increases.
The manual goes into allot more detail and can be purchased from John Deere publications. Manual number is FOS 20. Hope this will help. Dave Wickman

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