Wacky Idea?

I'd like to do the same to my H so I could put some decent lights on it. But-the GM alternator is too big to fit under the hood where the original 6 volt generator sits. I noticed there is room to mount the alternator on the right rear of the engine in front of the gas tank.

So, my idea is mount the alternator in a fixed position back there, then mount a bearing block with a 2 1/2 inch pulley in place of the generator and run a 1/2 inch drive shaft back to run the alternator. You'd need to put a couple of small u joints in the shaft, and you could direct drive the alternator by welding something onto the pulley nut that would connect to the shaft. My theory is, the tractors electrical system doesn't know where the alternator is as long as it's turning at the proper rpm, and it would all fit under the hood with nothing showing externally.

Wacky or not?

I'd far sooner go with F Dean's idea on the hitachi. I have a 4 cylinder Toyoto Camery here and I know that alternator would fit, giving lots of room. You'll buy either one of those alternators for less money than a reliable shaft bearing and pulley arrangement your talking about. Even new alternators are relatively inexpensive today.