Starter generator problems

[Graflex45]

I the armatures out of both starters i got and carefully filed and sanded the commutators smooth on the lathe. I put the one from the parts unit which looked to have the least wear in the generator body that was original to my tractor (with checked and rewrapped coils). I put 2 analog voltmeters on the tractor, 1 hooked to the generator armature terminal, and one hooked directly accross the battery. It started fine, initially it looked like the generator was outputting ok, but when i tried to manually short the F terminal to ground to make it charge nothing happened on the ammeter. I thought maybe the regulator is bad (which i checked and readjusted on the bench). I bought a new old stock on on ebay so I swapped that regulator in, still no making it charge. Also observed the voltage on it changed a lot when throttling up and down.
So i took the tested good generator i had ordered (cleaned commutator, new brushes and bearings, only cleaned the inside manually with a brush and wiping off look carbon and gunk with shop towels) reassembled it and put it on the tractor with the meters the same and the new old stock regulator. Started the engine great. Voltage on the A terminal steady and doesnt change throttling up and down. Grounding F got a strong charging current back to the battery and after running it for 20 min the battery charged up to the proper voltage.
I guess the field coils are internally shorted and causing issues? I cant see it being the Armature terminal coil because that is a heavy enough winding I could see the insulation between all the turns and it runs with enough torque when starting?
The coils from the 1101970 gen look like they are wound in the same direction as the other generator coils, are they both incidental replacements for the generator that was originally on the cub?