Quote Originally Posted by DynamicSound
Yep...adding more equipment that charges from the battery/alternator is putting the electrical system under more strain. Even though, visually it may help in dimming lights...actuality is it is hurting it. I would add the first step as getting a deep cycle battery to replace your stock battery. This will help out tons alone and is a quick and easy replacement.
This = truth. That is what I should have told you earlier. Try the deep cycle battery first then if absolutely necessary upgrade your alternator. Don't do it though unless you are going through alternators like underwear though. Keep in mind that when you go fooling with your electrical system you really NEED to know exactly what you are doing, because a screw up in your electrical system can affect more than just your stereo system and your lights. Seek a professional installer if you must do those upgrades.