Thanks Peter.
All other electrical issues aside, im quite sure the actual globe itself is working.
When I put the second alternator in, I accidentally hooked the charge light wire to the wrong terminal on the back of the alternator (as pictured below.)

Now as much as I have no idea what this did electrically, when I turned the ignition OFF, and removed the key, the charge light came on.
Again, I have no idea electrically what was happening here, but I did prove that the globe itself was actually working.
I have since returned it the AUX terminal, which I believe is the right one.
What little hair I have left is being pulled out!.
Dave