If your 1 wire alt is a SI series Delco, you can run it one wire, or if you want a working gen light or lower rpm excite / charging, you can wire it as a 2 wire or stock 3 wire type. The 1 wire type will work equally well in all three applications.
If your old alternator is a Delco SI type and appears to be wired correctly, it may only need a field flash to get it going.
With the tractor running at about 1/2 rpm, momentarily touch a wire from the BAT stud to the regulator's #1 blade. This should get it charging if nothing else is wrong, and restore the residual field magnetism so it will excite automatically the next time you start it.
If a 1 wire alternator has not been used for many months, the residual field magnetism can fade and need the field flash to restore it.
I still like that old Delco SI series alternator. In my opinion, it is the cheapest, easiest to wire and the cheapest / easiest to repair of any alternator ever built.
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