Headlight electrical issue help 66 sport fury

So I'm stumped. My headlights and instrument cluster pulsing while engine is running. They aren't going on and off but more like intensity pulsing and I cant figure out the issue.
The car has a new engine harness, bulkhead connector redone, dash wiring & fuse block redone, new painless wiring headlight harness with relays, new 90 amp alternator, new electronic voltage regulator, new headlight dash switch. Nothing else seems to pulse other than the instrument cluster backlighting and...

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Author: HOT FURY