The others have good ideas,but it could be a wire somewhere going to the coil,a switch,a terminal some where.I was a mechanic from 1977 until 1991.In that time I saw 2 bad coils.There is not a lot that goes wrong with a coil.I know a coil can get hot and not work,cool off and work,but usually its something else.Most of the time those crimp on wire ends go bad so I just twist the wires and put shrink tube on them or tape them.A switch or really anywhere there is a terminal that hooks to the coil eventually to make it run,could be a problem.Sometimes if you check the wires right after something like that dies you might get lucky and find a connection thats hot and that will tell you its loose.You can use a test light to see if you loose fire to the coil and that will tell you if its the switch or wire or what.If you are getting fire through the coil its maybe the condensor.
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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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