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A plain 12 volt coil only runs on 6-8 volts. That's because a resistor (external or internal) is designed into a 12volt system. The resistor is used to drop the voltage to around 6 - 7.5 volts and in turn lower the amperage through the points so they don't crystalize with the higher voltage/heat. A 6 volt coil has no resistor whatsoever.
Oct 2009
Part: ECH IC7 Product Line: Echlin Ignition Price:$51.49
12 Volt Coils Part: ECH IC14 Product Line: Echlin Ignition Price: $51.49 Each. Has "Use with External resistor Label Part: MPE IC14SB Product Line: Mileage Plus Electrical Price: $18.69 Each. Has "Use with External resistor" Label Part: ECH IC21 Product Line: Echlin Ignition Price: $42.99 Each Indicated 12 volts, Has "Use with External resistor" Label Part: MPE IC21SB Product Line: Mileage Plus Electrical Price: $17.29 Each Indicated 12 volts, does not indicate if External Resistor is Required. Part: ECH IC27 Product Line: Echlin Ignition Price: $54.49 Each, Indicated 12 volts, has "External Resistor is Required" Label. Part: MPE IC27SB Product Line: Mileage Plus Electrical Price: $12.79 Each Indicated 12 volts, does not indicate if External Resistor is Required. Part: MPE IC277SB Product Line: Mileage Plus Electrical Price: $13.99 Each No External Resistor Required
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