Old is the one that is on track. Look closely at the coil you're using and see what kind of coil you have. I'm assuming you're using a 12 volt coil, but it's either a 12 volt coil that requires a ballast resistor or it is a non ballast coil that takes a straight volts.
The purpose of a ballast coil is to boost the output of the coil during cranking. Cranking pulls the battery down and therefore lowers the output of the coil. To compensate for this on cars and trucks, The ballast coil was introduced. The coil is wound so it gives full output at a lower input voltage. It's fed via the ballast resister which reduces the voltage into the coil which would end up being around 7 volts. During cranking, the ignition switch would short out the resistor to increase the input voltage to a full 12 volts and therefore the output of the coil for better starting.
Now, if you have a ballast coil and you run 12 volts to it continuously without a ballast resister to reduce the input voltage, the coil will over heat and eventually burn up.
How do I know this? I made the mistake myself and had to replace a coil as a result.
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