Check the small wires leading to your solenoid with a test light. The one that is hot when the key is in the start position should be attached to the "S" terminal your solenoid. If this small wire is hot all the time you may have a bad key switch or the wires got hot behind the key switch and are now touching externally or internally in the key switch. When an engine cranks for along peoriod of time like that key/ignition switches can and will melt. A hot connection is a loose connection causing high resistance thus heating up and melting any thing close to it.
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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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