The Kettering system has points allow the coil magnetic field to build and then, when the points are opened by the distributor cam, the magnetic field collapses and a large voltage (20 kV or so) is produced. The capacitor has two functions: 1) it absorbs the back EMF from the magnetic field in the coil to minimize point contact burning and maximize point life; and 2) it forms a resonant circuit with the ignition coil transferring further energy to the secondary side until the energy is exhausted. the high voltage circuit is "grounded" to the battery through its internal connection (in the coil) to the primary winding. That winding is connected to the ignition primary wire from the ignition switch and through the above mentioned resonance with the condenser. Jim
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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