You always have the toughest questions... your just way above the rest.

I dont know what to tell you, I just got a new regulator, popped it in plugged it all in and it works.

It is weird that both are now not charging... did they go out at the same time and you changed out regulators at the same time?

EDIT: After some research, I found that for these 6v tractors with generators on them, they need to polarize their regulators... and that "This problem does not exist with an alternator, but only generators."

Quoted from http://www.antique-tractor.com/pipermail/farmall/2004-June/000089.html