Posted by RusselAZ on May 02, 2013 at 18:12:05 from (173.87.184.177):
In Reply to: 9N distributor posted by John Christy on May 02, 2013 at 16:11:30:
current flow is from the switched post on the ignition switch to the positive post on the coil then to the insulated side of the points and when the points are closed, to the body of the distributor. So, if you have power to the positive post of the coil an a bench you should have the whole thing "hot".
When the points open the coil field collapses and the spark goes to the plugs thru the rotor. Spark does not occur when the points close, it occurs when they open.
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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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