Frustrated! Car dying again while driving! Battery?

[BklynJay]

Ok. I'm sure very few of you know that about a month ago I bought a new alternator 200amp thinking that was the problem. Now I don't know - maybe my 3 year old Yellow Top Optima is dying?

First off I have a system custom made. JL 13w6v2, JL 500/1, JL 300/4, 5 farad. Professionally installed with diamond audio speakers inside with HU of Eclipse.

Here is what happened about a month ago which almost happened again today driving to work.

Driving on the BQE with the lights on since it's raining about 15-30mph since it's always traffic. Radio only on volume 25 - loud would be 50 and over for all who does not have a Eclipse HU. AC on fan power 1 only for the moisture in front and back. Then the nightmare starts (again).

First I hear a POP and my headunit shuts off. Look at the dash and see the battery light appear momentarily. So I immediately shut off AC and headlights. The Eclipse HU turns on but I shut it off. Radio is always first to go. That was today, last month same issue but went further to one headlight shutting off then VSC, ABS, VSC OFF lights turn on the dash where the car will almost died by then. It didn't get to that today since i immediately turned off the AC and headlights and continued to rev the car.

So now what? Yellow Top Optima D34 is only about 3 years old and a new 200amp alternator.

I guess later today I'll check what my voltage is. Can someone post the correct reading to the following questions? I did search but getting too many different answers.

What's should the voltage of the alternator be when the car is running?
What's should the voltage of the battery be when the car is running?
What's should the voltage of the battery be when the car just gets turned off after driving?

Obviously what is voltage is good and what voltage is bad?

Any help would be great!