No solenoid. A 24 volt system with the center grounded. Uses 24 volts for starting and charging, put has a pair of 12 volt grounded circuits for lights and accessories. JD did that for two, four and 6 cylinder diesels at least through 1968.
Its probably not been butchured though many don't understand it. Its not a lot different from the 120/240 volt DC electric systems that Edison used except the battery supplies the center tap, not the generator.
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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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