Well I feel sort of silly... there is a third key position, which starts the tractor right up

. I took that odd jumper wire off (which ran from the positive coil terminal to the safety switch terminal on the solenoid) and now the ignition circuit operates as normal.
Only problem is, I’ve realized that the charging system is not working. The battery voltage does not increase when the tractor is running versus when it’s stopped. I took the S/G off of the tractor and did the field test where you spin it up with 12 volts, and then put +12v to the F terminal while it’s still spinning. It had no effect. I then opened up the S/G and found that the wire that connects to the backside of the F terminal is totally busted off. No wonder it didn’t work... Is there a way to reattach this wire? Perhaps it was soldered at the factory?
I’ve attached a couple photos, one of the S/G as it was connected before I took it all apart (and the wiring doesn’t seem right to me either, based on the diagram I’ve seen in the service manual), and one of the broken wiring connection. Sorry about the rotated pictures... not sure how to fix that
What do you guys think? Is this fixable?