John, it sounds like he doesn't know the answer to that question...
By the description of his problem, I would say yes, he almost certainly does have an alternator with an external regulator.
wallacedw, the tractor's owner's manual is not going to help you here because the wiring is no longer stock. Simply replace the broken regulator with another 12V regulator, and things will go back to normal.
Tractor regulators are pretty much universal, all look the same, and have the same connections. Take yours off the tractor, go to NAPA and get one that looks the same.
Make 100% SURE that you have a 12V system, though. If you put the wrong regulator on, you will have problems.
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