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Ok, my system is comprised of 1 Alpine MRV-F340 (~200Watts) and 1 Phoenix Gold Tantrum 1200.1 (~1500Watts). Alpine Type-R components in the doors, and Type-R 6x9's in the deck, 1 JL 12W7 for bass in a ported box. Now, first off, my lights dim pretty badly. At most volumes, they dim. Its getting really bad to where im afraid to play it loud at all after dark because i dont want to be flashing other drivers. The birthsheet for the Tantrum says 158amps average draw. Now the dimming is with my input sensitivity on the amp about 3/4 max. Im pretty sure by now, that I need an HO alt. Heres where the question comes in. Where do i find a HO alt for our cars. I want to be able to fully supply my amps with power, with them both running at max power, at idle, with all my accessories on, and no dimming anywhere. Im guessing im gonna need around 200amps correct? So where can I find such a beast of an alt, how much is it going to cost me, am I going to have any use for my old alt, and even though its a long shot, how much better results will I get by upgrading the grounds to the alt, and replacing the battery with an Optima. Thanks

 
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Upgrade the big 3 under the hood - either 2 or 0 awg

batt-alt
batt-ground
cant remember the last one ground-block i think

upgrade to a deep cycle battery.

if those dont help then you will need a new alt. these are a cheap fix and always a good idea to do. with bigger systems

what size wire do you have running to the amps.

 
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And go to a mechanic and have them test the amperage draw with a battery tester while your system is on..if your drawing over 60amps..a H/O alternator is the only option...