Flicker flutter

Bewy said

If connections ok, I would try another battery if you have, even if you just hook up with jumper leads. The battery acts a 'large electrical anchor', for want of a better term; it smooths out the pulsating DC waveform of the alt output. If the battery has high resistance internally [ or in the main connections ], it may not be smoothing out the pulses, which you see as flickering lights.

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although the battery is brand new , I’ll pop in another one just to try. You hit On something that I’ve also thought , “ smoothing out the pulses” it’s funny how it pulses , as if it’s in tune with the engine , if we said , ding ding ding ding ding ding, (as if it was the engine at idle) at the beginning of every “ding” , the lights flicker. Not so much at idle but from 1500 rpms and beyond.