Re: New 12V coil, coil says use with resistor

Posted by Alont on January 20, 2004 at 20:04:59 from (209.71.219.207):

In Reply to: New 12V coil, coil says use with resistor posted by Bill in Orono, MN on January 20, 2004 at 17:15:00:

Hi Bill
older style 12volt coils and 6 volt coils were manufactured to run on 6 or 12 volts with the primary side coil wound to withstand the constant voltage for which it was designed, I used to have cars and motorcyles with these fitted.
When the engine is being cranked a 12 volt system battery will drop to about 9 volts hence the output at the coil secondary(the plugs) would be correspondingly lower during the cranking.
To improve this the manufacturers introduced a coil which was wound with a primary designed to run on about 9 volts.
A resistor was introduced in series(in line) with the coil which dropped the 12volts down to 9 volts at the coil during normal running.A relay operated during the cranking stage to bypass the resistor and provide the full battery voltage to the coil-which would have dropped to about 9 volts whilst cranking.This is the coil,I think, you were offered by NAPA. Hope this helps a little.

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