I have a 2008 tl with a 1000watt apline pdx 1.1000 pushing a JLw7-12. I noticed the led drl dim a little when the volume is turnt up and the speaker is kicking.
Im using good 4ga power and ground wire not that cheap stuff. Im using the factory radio so i tap into the factory sub with the line out converter. I scratched off the paint where i grounded. I've searched around here and i seen someone say 1000watt is enough for the tl to handle. So my question is do i have to change out my alternator to something with more amps or do i just have to change out the big3. Or should i not even have any problems at all and its just my conncections.

 

i have an 06 tl and im running 2100 watts and the only thing that dims are the interior light (the ones you click on an off)

 

So does that mean my alternator is going bad? I checked the voltage by the amp on the power and ground lead and there is a drop in voltage when the speaker knocks at high volume maybe to the low 12s.

 

Maybe use a harness so the DRLs get their power right from the battery? Big 3 is really easy on this car, I did a grounding star around the engine to both fenders and a larger negative battery terminal. I don't have LED DRL's but nothing dims with an 800 watt amp.