Re: 12V Conversion coil question for John T or oth

Posted by John T on March 31, 2007 at 20:08:39 from (66.244.90.5):

In Reply to: 12V Conversion coil question for John T or others posted by Ron in Nebr on March 31, 2007 at 19:45:41:

Ron, Many 12 volt systems (car or tractor) still had the 6 volt coil even though it required the external ballast and theres one big advantage that system has. Its that if the ballast is external, its possible to by pass jump aorund it ONLY WHILE STARTING for a hotter starting spark. Thats cuz while cranking the battery voltage can drop drastically at cold temps so with an external ballast its easy to by pass it while cranking which could improve extreme cold weather starting VRESUS a coil that had no external ballast capable of by passing.

NOOOOOOOO a 12 volt system that uses a full true 12 volt rated coil (some call internally ballasted) DOES NOT USE EXTERNAL BALLAST.

A weakness in point ignitions is excess current would cause premature point burn up so the current is limited to 4 amps or under. Therefore since a 6 volt coil only has say 1.5 ohms resistance you need the other 1.5 ohms of external ballast so the points current is limited to 4 amps. A 12 votl coil already ahs 3 ohms of primary resistance so no extra balalst is used.

John T

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