Jim,
I will get some pictures. It may be a few days, have quite a lot going on right now, which is why I just switched over to the other tractor.
As for the PTO, the one that we put on is OE IH, as it came from an early production 1650 (cast iron lower grill casting, tin insert steering wheel, bushing in the frame for 3 point, Dad owns the tractor, the engine blew (threw rod) and was replaced with another engine).
When we pull it apart, I will take pics and inspect everything.... but as you suggest, I'm afraid that I have let the "magic smoke" out of the field coil........
We at least have a spare that I an replace it with if needed.....