Battery Light

[megax29]

2004 3.9l automatic w/ about 108k. I have an amp and two twelves in the back but have never had problems with them or the wiring to the speakers. In the last week I've noticed that when I play w/ my car hard the battery light flashes in my gauges. I'd like to know if anyone knows why. My best guess was maybe there wasn't enough electricity going through my ignition wires. Maybe my battery is failing? I bought my car brand new and have never changed the wires. The plugs were changed at around 85k. What does everyone think?

[bullitt482]

Change the battery and alternator, especially with that kind of mileage and especially with an aftermarket stereo.