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Old 06-26-2019, 04:59 PM   #1
rer_239
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Default Coil

Should both screw terminals on the coil show voltage when ignition switch is on?
Thanks
Dick
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Old 06-26-2019, 05:14 PM   #2
Werner
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Default Re: Coil

Dick, one clamp always shows constant current / voltage. The other terminal depends on whether the breaker contact is open or closed.
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Ford Model A Roadster, 1928
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Old 06-26-2019, 05:54 PM   #3
rer_239
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Default Re: Coil

Thanks Werner makes sense if I'd stopped to think about it.
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Old 06-26-2019, 06:13 PM   #4
Mulletwagon
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Default Re: Coil

If the system is unmodified, voltage should be present on both coil studs even with the ignition switch off. The ignition switch is wired between the downstream coil stud and the distro which allows the regular grounding through the points to collapse the coil magnetic field and produce the high voltage in the secondary coil winding. A modified system such as electronic ignition, negative ground, 12 volt upgrade is entirely different. On those systems the ignition switch normally supplies voltage to the coil.
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