Flickering or pulstating Headlights

coalman said

Don't you need an adapter plug to do that?


Yes and yes on the regulator and alternator, and so this is normal with the voltmeter? Thanks

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I dont know. I haven't hooked up an analog voltmeter while driving or at idle. I have seen the digital meter jumping around a bit at idle. I'll see something similar on the ammeter at idle - especially with a revised squareback. I think its the battery surface charge coming off (discharge) and then alternator making up for it (light charging).
It could be the dead zone @KitCarlson was explaining here.
Anyone Running A Mechanical Voltage Regulator 67 Dart 273 2bbl
Probaby need an oscilliscope or someone with experience.