I will second that the regulator is more than likely bad. It is real hard to find good ones these days. Most are imported JUNK!!! I have had to go through several to get one that works correctly.
If the one he has is not still under warranty he can take the cover off and clean the contacts on the cutout part. They maybe burnt together.
If it is not under warranty then take some pictures of the regulator with the cover off and we maybe able to walk him through trying to make it work.
I also had one several years ago on an old motor that would work fine but the cutout was burnt up. So I put a heavy switch in the battery supply wire to it. I just cut the current to the regulator when it was not running. Ran it that way for a few years until I found a NOS US made regulator. It was on a Wisconsin motor on an air compressor.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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