Do you have any other engines around? Nevermind the brand.... You can use just about any on that system and it will work. But, I wouldn't borrow one. Just in case you have some weird short that is killing the system.
So... This is my suggestion. Start the tractor. Disconnect the positive battery cable from the battery after you get it running. Then, use the jumper wire to run from the Pos battery post to the output of the R/R. Maybe you have some odd short that is shutting the V-Reg off.
Another thing that is possible. The stator could be leaking A/C current into the ground side of the system and shutting down (or possibly even frying) the R/R. It wouldn't take many amps (less than an amp) to shut it down. However, when this happens it generally screws with the ignition. You may not be able to even test for it, as it would be hard to find, and may not register.
Did you ever do the test George suggested? Testing to see if the A/C voltage was falling off when the system tried to charge? You would have to back probe the two wires while everything was plugged in to test that. Did you do that??
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