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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Today's Featured Article - Two-Brush Generators - by Chris Pratt. Whether for product liability or because the aftermarket parts and labor business is lucrative, this concept is disturbingly prevalent. Fortunately when you step into your shop and make that jump 50 years back in time to work with your old tractor, this concept goes out the window. Even so, when it comes to the charging system, people quickly revert to this idea and start replacing the major components one at a time until it works. The reason you don't find any decals in your replacement set wit
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