I am in real trouble. In my f150 i have a 15" lcd monitor, and 2 1100watt amps powering 2 15" subs everythings memphis and i also have another battery its an optima redtop so im running 2 batteries. But my monitor is drawing to much power so i need a hi ouput alternator for a 2002 ford f150 5.4l v8 if someone neone knows where i can find one please help thanks a lot

 

You need at least 200 amps or more. (15v x 200 amps = 3000 watts.)
Look for a shop that does ambulance, fire trucks, and police car work to get a proper job done.
There's more to this than just bolting an alternator.

 

Here's one that will cost you a nice $300 or the chrome for a mere $500. I'm in a similiar situation needing at least 250A. The stock electrical system is still alive LOL.

(Edited for correct hyperlink)