Hey guys and girls, I think I need a new alternator, but please tell me if I'm missing something here:

About 3 months ago, my daily driver displayed a glowing battery light. With a multimeter, I found 12-12.5V at the battery with engine running to confirm I wasn't charging. I removed the voltage regulator and found the brushes right at the wear limits. I replaced the regulator, charging voltage after repairs at 13.8.

Last week, same symptoms recurred: battery light and not charging. I removed, inspected, cleaned and reinstalled the voltage regulator and now have 14.7 volts. Car starts reliably and battery light has stayed off. I thought my problem was fixed, but I'm now having wierd symptoms:

-headlights are flickering from ~50% brightness to 100+% brightness with engine ~1000-2000rpm. Headlight brightness more stable above/below this rpm range. Radio backlight/display with same flickering symptoms.

-turn signals are working, BUT blinking very non-rhythmically...instead of a predictable "tick tock tick tock tick tock", they're more like "ticktock tick tock tick tocktick".

Confirm I need an alternator?

Thank you!
Brad