The failure mechanism there would be high amplitude interference spikes coming back down the line when the spark plug fires. The resistance wires have about 5k ohms or so which does a good job of attenuating the feed back. Sometimes a little inductor can be used with solid wires. The inductor resists the high frequencies of the spark but offer low resistance to the dc current once the plug is fired and for the duration of the dwell and can make the difference on plugs that need a lot of energy to fire properly.
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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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