Posted by Janicholson on July 09, 2016 at 20:28:58 from (97.112.56.175):
In Reply to: Ignition Coil 12 volt posted by gdtractor on July 09, 2016 at 19:48:30:
The use of a coil with 1.4 ohms will draw more than 8 amps on 12v. (let alone 14.2 running volts) that coil with a ballast resistor will still draw lots of amps. The points in a conventional distributor will burn up quickly either way. The coil can work with a resistor, and electronic ignition. Voltage is a function of a fully saturated coil primary (dwell) and spark gap/wire resistance. The wider the plug gap the higher voltage it takes to jump it. I would use a coil with 3.5 to 4 ohms W/O resistor, and 2.5 ohms with a resistor. If electronic, go with the recommended coil from the supplier. THere are no internal resistors in coils, just enough windings to operate at a specific run voltage. The confusion comes from the words "external resistor required", which implies that some have an internal resistor. they do not. Jim
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