Farmall super A charging problem

I have a late 50s Farmall Super A that runs strong but has only one problem. The battery will not charge while the tractor is running. I checked the battery and it is good, but it will not charge while it is running. I rebuilt the generator, woltedge regulator and the starter and they all checked out fine. I have a new wiring harness but I have not put it in yet. I wanted to wait until it was painted. If you have any ideas to what the problem could be please suggest anything. Or were to start checking for problems.I checked an it doese have a generator not an alternator. THANKS.
 
There's kind of a shopping list of simple things, Dave. Starting at the front, how's your belt tension? If the generator has been rebuilt, have you polarized it? Is your regulator of the right polarity? Some are specific to + or - ground, others are indifferent. Are your contacts, especially ALL the grounds, and especially those for the battery and your regulator, clean and shiny? Could be anything, but those are a few things to look at first.
 

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