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Percy, youre right that if its a full true 12 volt coil NO BALLAST IS REQUIRED. How can you tell if its a 6 or 12 volt coil if its not labeled??? Use an ohmmeter on the R x 1 scale and the primary resistance measured between the lil + and - terminals will be around 1.25 to under 2 ohms if its a 6 volt coil but more like 2.5 to 3.5 ohmns if its a 12 volt coil. NOTE 1) A coil labeled "12 volts for use with external ballast resistor" is in reality only a 6 volt coil n requires a ballast just like it says it does. If labeled 12 volts or 12 volts not for use with ballast resistor then its a 12 volt coil no ballast used NOTE 2) Some coils designed for some electronic ignitions are NOT like the regular old points n condensor coils. They operate from a higher voltage pulse/spike and dont operate like the old ignitions. Its still possible to get a spark from then usign points but thats NOT really what they were designed for NOTE 3) In and around the seventies Chrysler had a first generation elec ignition that used a regular looking can coil buttttt ttt it had a 2 unit external ballast resistor. One was for startign another for running. I cant say at what exact voltage those coils ran on but if thats the coil you have it may require a non standard (which is 1.5 to 1.85 ohms) ballast resistor size. If youre not using that size ballast with that coil it may have a weak spark or may be running too hot n breaking down My friend Old is right on the money in that if the coil is so hot you cant lay your hand on it it may be a 6 volt coil and needs a correct sized ballast usually the 1.5 to 1.85 ohms range. This ought to be alllll ll you need to know to figure out your coil questions John T
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