I edited my original post to say this : I'm not getting a SOLID battery light, it's just flickering once for probably a half of a second immediately after turning over. Engine runs fine and starts without hesitation every time. But it's still worrying me and I'd like to figure out why I get that VERY brief battery light almost every startup.
This alternator was a rebuilt from reputable local reman company, albeit no Bosch logo on it. And it has been ~ 1 month since the repair.. I'm praying it's not the alternator again because that job was a PITA, although it will be easier the second time lol.
I load tested the battery today, and it tested fine lots of CCA available (over the rated amount) and it occurred to me: is this possibly parasitic battery drain? What's the accepted way to test for parasitic drain on our P2 cars? Since you have to have the key in POS II during battery connection, I'm sure my ammeter wouldn't like to see such a large influx of amperage.. unfortunately don't have a clamp DC meter so I have to connect in series
EDIT 1: .02 draw when dead.... could my issue be the starter pulling the alternator down too much? Or am I still looking returning my alternator and doing that job a second time?