Dimming lights

hey wussup again i was driving last night and wen i have my radio on my headlights dim wen my subs hit, this has never happened before does any1 kno why, maybe my battery or alternator is dien out on me?

Does this happen when you put any other load on the electrical system (e.g., turning on blower, rear defroster, power windows)? If not, I would first look for a short in the speaker system, assuming that everything was fine until now. If you just put the system in and it has been happening since you put it in, it may be pulling more juice than the stock alternator and electrical system can provide. You may want to look at how many amps it's pulling.

na this wa shappenein when i was at a red light i just noticed them, this has happened when i had my system hooked up to my stock battery then i upgraded batteries and it went away and now its back

Sounds like the alternator can't handle the amps.

I agree. Upgrading the battery isn't going to help if the alternator can't keep up. You'll get more cranking amps, and the problem will go away initially while the battery is fully charged, but eventually, it's going to run down to the point that you'll notice it again.