The original Farmall M was 6 volt whereas the Farmall MD used a 12 volt system (two 6 volt batteries in series to give 12 volts). Compared with the 6 volts for the gasoline/kerosene/distillate engines with from 4.25 to 1 (kerosene) up to 5.9 to 1 (gasoline) compression ratio engines the 12 volts would handle the MD with 6 to 1 compression ratio on gasoline for starting. The Farmall MD was only about 14 to 1 compression ratio on diesel, about as low as one can go for diesel engine. My small IH German built D-214 2 cylinder diesel engine has a 19 to 1 compression ratio.
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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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