Assuming you are dealing with a 10SI alternator. if pulling the plug on the alternator cures the symptoms and changing the alternator with a known good did not, check the voltage on the #1 terminal. There should be about six volts with the key on and no voltage with the key off. There is no diode on the diesel tractors but there is a resistor. Power for the #1 terminal comes from the key switch through the resistor and then to the alternator.
If you tractor is an early model with a 10DN alternator there should be no voltage on either small terminal with the key off. With the key on there should be about six volts on the F terminal and no voltage on the R terminal. With the engine running the voltage will vary on the F terminal depending on alternator demand. The voltage on the R terminal when running should be about 6 -7 volts AC.
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