2005 Silverado. I kinda dove deep and purchased an alpine f65 supporting the spr 60c in the front and sps 406 in the back and an alpine m240 supporting 2x pdr 12d4. My ? is what kinda alternator , battery, cap, etc do I need to support all this power. My current set up is stock head unit with bose speakers and 760w pioneer running 2x 12s. No cap stock battery/alt. Headlights do dim with beet.