Re: 12 Volt coils

Posted by Doug in OR on September 25, 2004 at 18:57:17 from (24.20.250.197):

In Reply to: 12 Volt coils posted by GeorgeH on September 25, 2004 at 16:50:11:

Let me complicate your life, if I may. (smile) To create a true 12 volt coil, they would need to double the number of windings on the primary side. The problem becomes one of the extra inductance from adding turns to the coil. You couldn't use a standard condensor and points if they did this. Most true 12 volt coils are merely a 6 volt coil with the ballast resistor already included internally in the coil. These would not be marked "use with external resistor". You can tell a 12 volt coil by putting an ohmmeter across the terminals. A 12 volt coil will read about 3.2 ohms.

To complicate this, many Fords used an 8 volt coil. They used a piece of resistance wire between the ignition switch and the coil to drop the extra 4 volts. If the coil tells you to use an external resistor, it is probably just a 6 volt coil that the manufacturer doesn't wish to have branded as obsolete.

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