Dashboard Battery light comes on intermittantly and noticing votage drop to 12.0 on 2000 Cadillac Eldorado

from operating at 14.1 or so. Happens during early acceleration. Battery has been replaced

2 answers 2 comments
Have alternator tested. It was probably the issue the whole time.
That's kind of what I thought. Starting there . Thanks!
have charging system tested
Ok. Alternator tested out fine