big 3 on a f150

[king ranch 5,000+ posts]

i have a 2001 f150 5.4l and i plan on getting 2 12's l7 with a 1500 watt kicker amp and then farther down the road another amp for my doors and another one for selenuimns for the grill

as of right now i ony have a sony xplod 1200 hooked up to one ten and right now my battery is having a hard time the headunit is turing on and off and my lights are diming when i am sitting still so do i need to get a new battery or alternator and also would the big 3 solve this the wires on my battery are pretty big rember i have a 5.4 but also i have an additional 600 watts of fog lights that i have on at night time

sorry this may sound confusing

thanks

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