my headlights are now flickering whenever theres any bass comin from my rear sub which is getting worse over time.

do you guys think this is just the battery or maybe the alternator? i wouldnt think the alternator would be going already at 49k, but with the drain comin from the amp im not too sure.

the volatage gauge in my nav screen shows 14.0 - 14.3 when the stereo is off or when driving..but when idling and with the system on it will drop anywhere from 13 - 11volts...or even if the system is off and i pull both windows up at the same time the voltage will drop from 14 to 11-12 immediately

 

It is one or the other, something is wrong. That voltage is way too low when you hit the windows. Take it by a decent auto parts store, most of them will test your system free and can tell you if it is the battery or alternator.

 

The flickering lights sounds like the alt. I've heard ours are a weak point. No problems (yet) from mine.