Posted by K-Mo on December 16, 2012 at 04:19:16 from (66.43.226.235):
One of my tractors was very difficult to start in cooler to cold weather. It would crank fine but no fire. If I jumper from a running vehicle, it would fire right up. I finally got around to study the situation. When I turned the ignition ON (not running), I measured a little less that 5 volts at the coil. I measured the ignition resistor and measured 2 Ohms. I went to the local farm store for a replacement it was also 2 Ohms. I measured the DC resistance of the coil and came up with 1.8 Ohms. I installed a 1.8 Ohm resistor and now all is well. The moral of the story, make sure the ignition resistor matches your coil.
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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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