With the points closed you should not get any voltage reading on the points side of the coil as the current should be flowing through the points to ground and any voltage reading you get is resistance between coil terminal and ground. So, if your points are not contacting or open you will have full voltage readings. That is the fact of the laws of physics. Try this, with switch on, hook a small jumper wire,(alligator clamp type works good)to the points side of the coil. Now , holding high tension wire from coil about 1/4 inch from frame, touch the other end of that jumper wire to ground, should get a low voltage arc from that jumper wire, now pull wire away from frame and you should get a spark out of the coil. Just remember this principle, the points are nothing more , or nothing less than a switch that grounds the primary windings from coil and every time that switch opens, the magnetic field in coil collapses around the iron core in coil and creates high voltage in the secondary windings, thus a spark. You are making a simple problem way too complicated.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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