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On some of the modern cars, one set of coils is positive and the other negative and the electrodes are made from a material that will deteriorate very slowly given the right polarity, Perhaps someone can explain it better than I can but on those cars half the plugs are one type and the other half the other. Keith Anyone know why a spark plug should be polarity sensitive? No matter what you do, one electrode will always be + and one -. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~