Suggestions already offered are all good. But here's another quick check before getting in too deep:
Look at the back of the alternator - make sure the regulator shorting tab (the small ear inside the D-shaped opening in the photo) is clear. If it is bent, or there is anything conductive caught on it so the tab is grounding to the case, the regulator is bypassed which causes the alternator output to "run wild".
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To Allan in NE: With due respect, there is NO tractor application (or any application for that matter...) with a design voltage of 16.5 volts. Running a 12 volts system constantly above 15.0 volts will destroy the battery in short order. It also dramatically shortens life of incandescent lamps.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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