Alternator not charging

Well got battery fully charged and had everything hooked up except the GRN terminal. Grounded the GRN terminal and still didn't charge. I also tested the Voltage at the Large black terminal of the alternator and at idle it was reading 11.3.

So I guess its an "internal problem". I do have a square back alternator that somebody gave me. So I will swap it out and see it that fixes it.

If you checked that you have battery voltage on the blue field wire with ignition in "run" that is exactly what I would do next