Posted by MarkB_MI on May 25, 2009 at 04:17:18 from (216.234.123.175):
In Reply to: Cracked coil, why? posted by erikyater on May 24, 2009 at 21:40:15:
I have seen this happen with a 12 volt conversion where there was no resistor in the circuit. I would also expect to have problems with points burning up. But sometimes coils simply fail, due to heat and vibration. If you can't find a resistor between the coil and ignition switch, replace the coil with one that specifies "12 volt no external resistor required".
At the risk of starting a flame war, I'll mention a myth that's often repeated here: Supposedly a "true 12 volt coil" is superior to using a coil with an external resistor. Fact: it makes no difference whether the resistance is internal to the coil or external to it. The coil's energy is the same in either case.
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