Posted by rustyfarmall on July 10, 2012 at 14:38:55 from (67.55.162.174):
In Reply to: 6V vs 12V coil posted by rrlund on July 10, 2012 at 13:22:47:
Quoting Removed, click Modern View to see
Near as I can figure out, ALL ignition coils are 6 volt. If the vehicle it is in IS a 6 volt battery system, then all is good and nothing else is needed. IF however the vehicle is a 12 volt system, then something needs to be in place to reduce the 12 volts down to just 6 volts. Usually that is accomplished by adding an EXTERNAL resistor, but it can be accomplished also by adding the resistance INSIDE the coil, so an external resistor is not needed. Those coils will usually be marked as "12 volt, no external resistor required", but it is possible I suppose that over time the printing will be worn off and then it would be nearly impossible to identify. Also, those external resistors come in many different forms. Just because you don't see one of those common, ceramic block resistors somewhere, doesn't mean there is NOT an external resistor or resistance incorporated into the wiring.
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