That resistor more than likely is used on the excite wire when a alt was used on later Farmall's that came from the factor with 12V it was there way of doing it instead of a diode are bulb... The IHC OEM number is 107558CI to the best of my knowledge that's the way they did it .
Other than that someone mat have used it to drop 12V to 6. If it worked nuttin wrong with doing it that way.
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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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