Back again... Hopefully my links work. They work in the preview.
The long awaited stator came in and it's a 3-wire
with a small diode located midway in the sheathing. I wanted to, but couldn't make myself, cut into that sheath and mess it up just to find where the third (yellow) wire emanated from. We were in a hurry so quickly installed it and I measured (at WOT) 48VAC on the green wire, aprox 14VAC on the yellow, and aprox 15VDC on the black. We wired the yellow (AC) to the lights, the black (DC) to the battery circuit, and the green to the operator relay (stator brake) shown on the schematic. The Diode (I can physically feel it) is cool, the battery charges, and the lights work. We even disconnected the green wire and noticed no difference in lighting or charging. See this image for old and new. Look at the stator terminations.
https://imgur.com/a/EPwtNH9Now, the OEM stator I removed from the tractor is a 2-wire as I originally thought. I removed the epoxy and wire clamp and there is no indication that a third wire was ever attached to either the green or black since no solder joint or extra crimping was observed. See the image at
https://imgur.com/a/mV4zoeD.
In the photo, I separated the two enameled stator wires that connect to the single black so I would end up with two separate stator windings that I can ohm out. One winding goes around all 16 poles on the stator with one end terminating to the black wire and the other end terminating to the green. The second winding only goes around 5 poles with one end terminating to the ground screw and the other end terminating to the same black wire.
So, it seems to me that the black wire from the stator terminated to the anode of a diode
along with an external yellow. Then the yellow (AC) went to the lights, the cathode of the diode (B+) went to the battery circuit, and the green (AC) went to the operator relay as a brake. I'm now positive the new stator has no yellow wire tap to the stator coil. It's just a two wire with the yellow tied to the diode anode.
Unless someone can correct me, the schematic, or wiring diagram (shown previously), which shows the two stator "coils" going to ground is clearly wrong. Only one does. Check out this sketch that reflects what I found.
https://imgur.com/a/UKT5CkuI still can't find out what's wrong with the old stator because I remember trying to charge the battery with just the black wire and diode. But hey.... the new one works perfectly.