1 - You have an externally-regulated alternator and you tractor is wired for an internally-regulated alternator. This will cause the alternator to "run wild" with no voltage regulation, exactly as you describe.
2 - It's wired up wrong. Correctly wired the alternator #1 terminal will show 12 volts to ground with the ignition on, and 0 volts with the ignition off. The BAT and #2 terminals will show 12 volts at all times (ignition both on and off)
3 (long shot) - You were sold a defective alternator. Have the NAPA dealer can put it on his test stand and check.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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