As I recall, most automotive jars have six cells in them, each putting out somewhere around 2.17 VDC (nominal) x six cells. The individual cell voltages can be higher or lower than that. A jar has to complete a circuit across the six cells between the positive and negative terminals. Something opens in any one of the cells or from either terminal to the last cells in the jar, or a short across two of the plates in any of the cells...and its over. Sure jars can and do weaken over time across the cells as the plates scale or whatever, but on occasion jars have always been known to and sometimes will just go dead depending on the failure. Compare it to a light bulb going out when the filament suddenly opens and fails to complete its electrical circuit. You go to bed and shut off a perfectly good working light bulb, get up and attempt to turn the same light bulb on...and nothing happens until you change out the now bad bulb.
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Today's Featured Article - Experimental Tractors Article - by Danny Bowes (Dsl). Tractor technology appears to have nearly hit it's pinnacle of development. If you agreed with the subtitle, you are rather mistaken. Quite, actually. As a matter of fact, some of the technology experimented with over 40 years ago makes today's tractor technology seem absolutely stale by comparison. Experimentation, from the most complex assembly to the most simple and mundane component, is as an integral a part of any farm tractor's development
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