I have a similar dilemma, the pictures attached show what came off my to20, it never charged properly, I got it like that, I was going to clean it up lube the bearings and zap it, but that silver thing looks like its regulator, the one post that has no wire connected had a wire running directly to the battery post, negative, ( I believe or at least it should, it is a positive ground ), so what to do?
option 1 is to get the regulator and see if I can get it wired properly and working, I have a fairly new starter, and a ring gear that comes off so for the longest time I used the hand crank and charged the battery at night just to see if the rest of the tractor holds up, plus I had work to do with it and time was of the essence.
if this don't work I guess I am out $60 and looking at converting it, I think the kit was $150, not sure if it has everything I need, something about a resistor to protect the original coil? I'll need a battery that's for sure, maybe a new coil to be safe, it is starting to add up so what to do,
I was even debating getting a junkyard alternator, make some brackets and run the headlights in series with the battery, keep everything 6 v otherwise, in theory it should work but I wonder why this is not a common fix, I have not read of it elsewhere.
I still have to see about the flywheel, off topic, I will have to split the tractor, I am tempted to weld the ring gear to the flywheel and be done, some recommend getting the revised flywheel, but than I would need a clutch alignment tool, I have a couple from other automotive sets, but likely wont fit, clutch is good so I would not replace it thou in the past I have replaced everything I could when I open something up, this means the rear main too, which I read is a rope,
ohh what to do?
I am not trying to restore the thing just get functional, I got more work this coming summer, on a budget if possible, I am really trying not to get carried away and make a big project out of it ( dam it no pics yet, I'll try and upload them in a bit )