Ron, I would have to go through all my archives to be 100% sure BUT I think towards the end of the 3 brush genny era they were using full fledged voltage regulators on some 3 brush gennys. Of course in the beginning it was the three brush where you manually had to set the light switch for Low or High charge while the two brush and VR's was the new n improved method. I think if I were going to use a VR on an old 3 brush genny, I would adjust the third brush (if its adjustable) to the max charge condition as close as permissible to the fixed main non grounded brush and then if matched let the VR do its job of regulation. The VR's field current control relay and its onboard fixed wirewound resistor is supposed to set there and switch and chatter to control the gennys output versus the batterys state of charge and its supposed to be designed with the current ratings of the field windings in mind so as to NOT overheat them. However several 6 or 12 volt gennys had close to the same field winding ratings so perhaps different if still close VR's would still work even if not perfect.
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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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