Would a bad alternator cause headlight flicker?

But it's seeing a true monitored voltage right from the battery from a relayed 12v now....so next I'll try a new field wire temporarily. Oh, I also cleaned the ammeter connections and checked for tightness. If this regulator turns out to be iffy I have access to a high quality adjustable isolated field I have used on many a bike install that have excited field alts. It quit boiling battery's on my 74 Xs650

oh and new grounds everywhere. Right to the case from the battery with a star washer. No voltage drop at all there.