I'm at wits end. My alternator/battery light on and it's charging 12.1V so I know I have a charging issue. I replaced the voltage regulator and now with engine not running I'm getting 12.8V, 14.0 at idle and 14.1-14.2 at 2000 rpm. If I turn everything on (headlights, heater blower on high and rear defroster) I get a fluctuation between 14.0 and 13.9v which I find completely normal. The light comes on about 5 seconds after start and stays on although still charging at 14.0V.
My battery is 2 months new, alternator pulley was replaced about 10k miles ago, the car has 120+k miles, no fault codes. Rectifier diodes checked out fine. I can clear the message through an OBD scanner but it just comes right back on.
Anyone have any ideas please chime in, thank you.

 

I guess avoiding going to the stealer is not an option....
Maybe I can go to an Indy who has a STAR tool could be my other option.
Thank you Plutoe for your fast input.