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 - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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