Re: 12 volt ignition coil
When 12V systems came out in the mid 1950s, ignition coils remained the same for 6v systems, but external resistance was added. When starting the car, the add-on resistance was bypassed to give the coil a 12V boost. Once the engine started and the ignition key went into the run position, the extra resistance was cut-in so the coil ran on 8v.
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Bob Bidonde
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