This is great, guys, thanks. That sounds like the best idea. I have a fair amount of electrical experience so I'm pretty sure I could wire it in. But I'm worried about physically mounting it. Does anybody know whether a Delco alternator will fit on the same mounting holes as the original generator? Otherwise, does anybody know how involved the required modifications are?
You may get all the mounting parts through JD or try a tractor wrecker. It was common practice years back to convert these older tractors to alternators.