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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