It was frustration like this that led me to put an alternator on my 1966 140 five years ago. I haven't thought about my charging system since. The replacement regulators you get today are nothing like the original Delcos IH put on these tractors. Bad out of the box is not uncommon. I had gone through a couple of rebuilt/reman generators and regulators in the ten years previous. They just didn't last like the originals did.(about 25 years for both.)
Jim--His tractor, and mine, are definitely 12V negative ground from the factory.
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