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Old 11-14-2017, 05:04 PM
BobTurner BobTurner is online now
 
Join Date: Dec 2011
Location: Livermore, CA
Posts: 5,400
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The reason for the polarity reversal is that the mags have a magnet with both a north and south pole, and both are used. Look up the firing order for your engine. The first, third, and fifth cylinders in the firing order use one polarity; the other tbree, the opposite. Move the plug from one polarity to the opposite. For a standard IO-540, you can move cylinder 1 to cylinder 2, 2 to 3, 3 to 4, etc.
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