I would just install the 8 volt battery and then run the vehicle for awhile. Then test the voltage at the battery. If it tests at 9 volts or more, then you are good to go.
The battery itself will limit how many volts can be charged into it.
A 6 volt generator is capable of producing MORE than 6 volts.
I own an H Farmall that had an 8 volt battery when I bought it. That battery was dead, so I replaced it with a new 6 volt. I changed NOTHING on the generator or the voltage regulator, and the battery stayed charged, but was not over-charged.
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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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