alternator??

My '95 Buick Regal with the 3800l eng has an intermittent battery light coming on. I put a tester on the battery and it only had 115 CCA so I replaced it. The battery light continued to come on intermittently. I put a multimeter on the battery with the engine running and the readings were erratic, but with the battery light on it was reading 16+ volts.
Is it a safe assumption that the alternator is overcharging and requires replacing?
THANK YOU!

Chris

Sounds like the regulator inside the alternator is bad. If it is charging 16V, you better do somthing quick or else you will have a host of electrical problems.

16 volts is too much...more common when the alternator goes bad they undercharge...i had a car that overcharged...i noticed it because , at night, the dash lights looked like Times Square......