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 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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