The path doesn't include but one plug at a time (on this engine, (several engines have a wasted spark on one plug of 2 firing at once from the same coil) Thus there is only one path for volts. All open gaps in the spark path are additive. Thus if the rotor gap (as below) was 1500 volt and the spark plug in fuel and air was 6000 volts, it would take 7500 volts to jump. If the leaking plug's fouling was draining at 1000 volts and going to ground, the total would be 2500 volts and never jump the real plug gap. If an added gap forces 7000 volts to jump it, the plug will now get a zap of that voltage plus the rotor gap 1500. 8500 volts now does jump the intended gap and the plug fires. Jim
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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