Posted by John T PS on July 10, 2016 at 06:05:24 from (216.249.81.101):
In Reply to: Ignition Coil 12 volt posted by gdtractor on July 09, 2016 at 19:48:30:
OOOPS my bad, Before anyone or some Troll has a calf or jumps out of the woodwork yelling GOTCHA I was in a hurry (ITs Sunday morning you know) and made a mistake below
For a 12 volt tractor a 1.4 ohms LV primary coil IS TOO LOW and points would burn up prematurely, an elec switch can handle more coil current. I was hurriedly thinking about a 6 volt system where 1.5 ohms could work. If you used such a coil with an external series voltage dropping (12 to 6) current limiting BALLAST RESISTOR the points wont burn up prematurely but lower current wont yield as much energy either !!!!!!!!!!!!
Sorry about that, so many questions so little time but I try my best to help
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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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