I had a issue last week with my Alternator not putting out enough power. I had trouble with the car starting. The car would be near 12.5 amps output which is not good.

So I removed it, rather easily and the Amps have improved to 13.0-13.1 amps.

Still a little low, I am going to replace the Alternator. My buddies 02 z28 puts out 14.5 amps. So Its time to replace it. After that I should have all the charging issues solved.

If anything happens, I will replace the battery.

 

I assume you mean 12.5 volts, not amps. At idle, voltage output will be dependent on idle speed. A4's idle at around 650 rpm, M6's can idle 800 - 900 rpm. Most auto parts stores will check your charging system for free.