Pertronix lists the operating voltage range as 8 to 16 volts. My cranking voltage is dropping to around 8.2 volts ( I think) which is not below the threshold. I haven't used any high tech voltage readers to be sure. Just a 50 years old analog voltmeter which may or may not be off a bit. I'm going to stick a new high-tech voltmeter on later to verify.
I doubt that the Pertronix unit actually ceases to function at exactly 8 volts. But maybe? Seems silly if true. A battery loses half its power at 0 degrees F. If you want to start a gas tractor at below 0 F temps, it would not be unusual to drop to 8 volts when cranking. If Pertronix is any good, it should be capable of working in those conditions. In my case with this 1010 though - it's dropping to 8 volts at 50-60 degrees F. So if I were actually cranking at below 0 degrees F, it would probably drop even lower.
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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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