Had to track down a similar gremlin on a customers ford product years ago.
Only happened about once in two weeks and by chance only when the customers wife would drive the car to work, by days end the car would not start.
Tested the system multiple times and no draw on the system was present, battery tested fine, charging system tested fine. drove the car myself for a week and no problem.
Turned out that if the alternator came to a stop in just the right position it would create a draw, enough of a draw that with the key off the shaft at the pulley end was magnetized enough to hold onto a wrench.
Give the alternator pulley a half turn and the draw went away.
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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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