Sure sounds like the alternator excite circuit is still hooked up and is causing a back feed in the system so the engine will not shut down. Be very careful if you unhook the battery with it running you can let the smoke out of the alternator and or your self if you get hold of things wrong. Alternator can put out well over 50 volts at more then 30 amps and tat is more hen enough to smoke test your heart. You big problem will be figuring out where you need to put the diode and I do not know the wiring on that one well enough to help much with out a diagram that is. If it would help you can e-mail me and I'll give you my home phone number if that would help you any.
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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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