"A few months after I got it the alt quit so I replaced it. The new one lasted a few more months and then also quit."
"When I pulled the knob that connected the alt to the battery after startup..."
What is this switch? Is it a switch in the #1 wire to the alternator to energize it to begin charging or is it a disconnect switch that you turn off when the tractor is not in use, then turn it on when the tractor is running and you want to charge the battery.
Your description sounds like it may be the latter.
An alternator needs the battery load when running. I'm wondering if a no load at startup and then a surge when you connect the switch is what is causing your alternator failures.
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