Like Jim said, check the bottom of the pulley grooves for belt contact. There should only be contact with the sides, not in the bottom.
Also look for even wear inside the pulleys, could be a bent or separated (broken weld) pulley.
Check the bottoms of the pulleys for any thing that doesn't belong. Once had a mower that would throw the belt. Found a chunk of bark wedged down in the vee. Had to dig it out with a screwdriver.
If all else fails try the factory belt. Something magically mysterious about them!
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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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