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Old 06-10-2019, 11:15 AM
Formulabruce's Avatar
Formulabruce Formulabruce is offline
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Default Ballast resistor

Have seen American autowire mention a 74-78 with Ballast resistor. I have now seen one on the back of a coil on a '74. I have my doubts about its originallity. The resistor wire and the balalst resistor are hampering the Petronix. Anyone seen a factory Ballast resistor in a '74 Points Ign. Firebird? ( V-8)

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Old 06-10-2019, 11:35 AM
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77 Canamman 77 Canamman is offline
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No ballast resistor on GM vehicles of that era. Only the resistor wire with points. There was no need with HEI, since they received full battery voltage.

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Old 06-10-2019, 03:11 PM
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Formulabruce Formulabruce is offline
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The "resistor wire" from harness is Black, Not yellow , and has 12.6 volts. Someone put a Napa coil in it that said it had to have a ballast resistor. This has limited the petronix. Maybe I should rip into the harness deeper. Thanks Canam

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