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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