Posted by Gary P_____ on August 10, 2012 at 13:18:43 from (50.33.184.167):
I converted my 1959 Ford 851 from 6 volt generator to a 12 volt alternator. It was easy and I am happy with that decision. However, after many hours of work the tractor just quit. Sounded like out of fuel problem but it wasn't. Also, the neon spark indicator indicated that all plugs were firing.
I installed a kit consisting of points, rotor, and capacitor and the tractor fired off immediately and runs great again. But, I wish I knew which of those items caused the problem. I tested my points with an ohm meter and they looked good. I don't know how to test a rotor other than by inspection and seeing if the plugs fire. My question is "how do you know that a capacitor is bad"?. Is there a way to test it. I had a weak spark that made me think electrical was ok.....it wasn't.
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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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