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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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