"I have an Allis that won't die when you shut off the key and that's because something is messed up in the distributor and it won't hold the timing. I'll get it fixed one of these days."
?? Please report back on that when you repair it. It will be interesting to understand how it does that. I always thought a distributor ignition system has to have a power source supplying the points, through the coil, to work. A distributor does not produce power, to my knowledge, so I don't see how it can self excite. I have seen bad switches, back feed from an alternator, and wires that had chaffed and made intermittent contact, supplying the ignition system with power at times. I never have encountered a distributor system that just runs on its own, like a magneto system.
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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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