Mike: Most situations we encounter on here are folks switching to 12 volt and putting a resistor in the system to reduce the voltage going to a 6 volt coil. Think about this, you already have reduced voltage going to a 12 volt coil. If you add a resistor you'll only reduce the voltage further. My thoughts if you have a true 12 volt coil your voltage at the points is already too low, the resistor will only reduce voltage even further. Your solution is go to a 6 volt coil.
Another factor you must consider is for some weird reason some 12 volt coils are labled 12 volt coil no external resistor required, while others are labled 12 volt coil requiring a added resistor. As I see it the first one is a true 12 volt coil, while the second example is nothing more than a 6 volt coil requiring a resistor when used as 12 volt. Why industry doesn't just call them 12 and 6 volt coils, beats me.
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