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The resistor wire 12250 is a thick gauge Pink wire that plugs into a Red/green wire out the back of the ignition switch. It plugs again into a red/green wire at the firewall. It acts as a ballast resistor to the coil. In '69's I think it also affects the tachometer

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1965 Conv:Street driven concours
1966 Coupe: Daily driver and toy
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