Replaced Alternator, battery light still flickering?

Hey guys, 3 weeks ago I flew from Chicago to Oklahoma and picked up a clean 01' 330i 5sp that I drove back. This isn't my first BMW, (2 e36 M3s before)- but I didn't own those for long and I'm still fairly fresh with these cars.

The problem:

150 miles in my drive home, the cars cluster light flickered, the car shuddered- and I managed to pull over to the side, waited a few minutes and restarted the car. Batt light still on.

Drove another 50 miles to the nearest stealership, where they said I needed an alternator (figured as much myself). Luckily I found an autozone Bosch reman (120amp) for $330 + core, and they charged me $200 to install as I watched in bewilderment at how easy it was. Luckily the master tech gave me a post inspection purchase, so that gave me ease of mind as everything checked out. Battery itself was still fine.

3 weeks later now- the battery light was flickering during driving. Stopped, turned off the car and then as I gave contact with the key- all lights were on per usual, but even then the batt. light flickered. Turned it on, and it idled and the light flickered intermittently- but nothing else, no noises or anything noticable.

Drove away, and it went away. So now I've been scouring messageboards... and a lot of people suggested replacing the voltage regulator instead of the alternator, but that shouldnt be my case since the alt. is brand new.

Any input?
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