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 - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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