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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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