Correct coil and resistance, 12 volt with 1247XT elect. ign

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Posted by Robert Millsap on October 24, 2022 at 16:54:35 [URL] [DELETE] :

I have a 1948 8N that has been converted to 12 volt negative ground with alternator. I have 1247XT Pertronix electronic ignition. It tan fine until recent engine rebuild. Upon reinstalling engine i am having trouble with ignition so am entirely replacing it with new 1247XT and new coil. Summit Racing is telling me if i use their Flamethrower coil w/3 ohm internal resistance, i don’t need ballast resistor. I have read Bruce Haynes’s posts on this subject and his 75 Tips For N Owners Based on what i read there, Summit Racing’’s advice does not sound correct and coil will overheat with high resulting amperage. Is it?


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