If it's a 3rd brush generator, what screw are you talking about where the voltage is regulated? Changing the location of the 3rd brush changes the charging rate by changing the amperage output of the generator. Never heard of it changing voltage, but maybe it does? That 3rd brush is mounted on the end plate into position relative to the two fixed brushes, some 3rd brush designs have the 3rd brush movable and anchored to the end plate by some sort of a screw hold down which has to be loosened before moving it. Other ones are on a movable ring that is not anchored with a screw but the 3rd brush can still be moved to change the charging rate. It just stays in place by the tension put on the ring it is mounted to when everything is assembled. I'm probably not answering your question. Not sure if 8.2 volts is too much or not.
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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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