I did an M last summer with a 10SI Delco. Problem with the large diameter alternators like a SI series Delco is that there is little room to swing the alternator from side to side to adjust the belt. Not much room between the valve cover and hood for adjustment. We built the alternator bracket with verticle slots 1.5 inches long where the bracket bolts to the engine. This allows the alternator to move straight up/down to adjust the belt with hardly any side to side swing. It appears to work well and is an easy thing to build.
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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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