[ThraxXx]

Yeah in my old car I ran an 800watt thump amp for the door speakers and a 1000watt 2 channel kenwood for the subs and I was getting some light dim. I replaced the battery with a redtop, had my alt rebuilt for higher output at ferris electric, and then I did the magic 3 (bat to ground, engine to ground, pos bat to alternator.)...once all that junk was done I had tons of power and no more light dim.

Power flow is the key here. Caps are what most call "the bandaid fix".