Hope this info helps: I have a new old stock COOP generator, paper tag reads possibly TO-7521, unsure of last 2 digits. Generator tag stamped Autolite GEO 4818A-3 5D, This generator has a cut out relay mounted on it with a wire coming out of the generator body hooked to the underside of it, and a terminal coming thru the generator body with a nut on it for hooking a wire to it that I assume is the field lead, this lead is grounded on my running E3 as it has been before I got it 30 years ago, I believe there was a wire going to possibly the light switch to control charge rate originally.
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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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