Why do my head lights and dash board dimm and also my bass loses power when I out the volume up?

Posted: 15 Sep 2013 05:49 AM PDT

I have a clarion vz407 head unit 3 yellow toos 250 amp alternator 0 gage wire fur curent and ground the big 3 uograde 2 l3 kickers 15 inch 8 inch midbass and 4 high mids for highs two audiofonics for highs and a orion 2400 for bass and my lights dim and my bas not hittin right goes down when I pick up the volume?