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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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