If it's REALLY a 1-wire alternator it doesn't need to be externally excited.
The voltage tells it all. You should be seeing 13.5 to a little over 14 Volts and you're NOT, so the alternator is BAD or there's an "open" between the output stud on the alternator and the (+) post on the battery.
To rule out an open circuit, with the engine running at mid-throttle and the lights "ON", check the voltage at the (+) battery post AND the output stud on the alternator. They should read within a fraction of a Volt of each other and be in the 13.5 to a little over 14 Volt range.
If voltage is LOW at both places the alternator is BAD.
BTW, is the belt snug and the belt and pulleys in good condition (belt not bottoming in any of the pulleys)?
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Today's Featured Article - Talk of the Town: The Pefect Collection - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: " I thought it would make for some interesting discussion for many of you to post what would be considered your dream or perfect antique tractor collection of five tractors, assuming room for storage and cost were not a factor. I have posted my "Perfect Collection" on the Farmall board. List any brand preference but keep
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