Lights dimming horribly with new system

[sfniner415 10+ year member]

I just installed my new system last night which consists of (2) 10" Arc Audio D4's powered by a Directed 2400 (1200x1) Cadence 5.25 MMX Comps powered by an Alpine MRP-F240 (40x4). This was all installed in a 92 Chevy Pick-up Truck with a stock alternator and stock battery.

Now my lights dim horribly when a big bass note hits, my voltage meter literally drops all the way down when it hits but it shoots right back up when the note is over.

I did the big 3 using 4 gauge wire and I have 4 gauge wire running to everything. I was told that 4 gauge wire was good enough for my system. Im thinking about upgrading all of my wire to 1/0 but its pretty costly and it would almost cost me just as much to buy a new alternator or battery.

Thanks

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[Youhearthat? 10+ year member]

You need a new alternator or a HO one.

 

[M@nJo 10+ year member]

switching over to 1/0ga wouldnt benefit you much. you're better off investing into an h/o alt and battery.

how many amps is the OEM alt?

 

[maldecido33 10+ year member]

i'd get an optima yellowtop and do the big 3 in 1/0 wire;

all that can be accomplished for no more than $230, maybe even less

 

[sfniner415 10+ year member]

I just found out that my stock alternator is 60 Amps

Can anyone point me in the right direction on where to get a H/O alternator for a decent price?

 

[andar 10+ year member]

i got a 90 amp alternator from a local junkyard for like 35 bucks. not much more power, but it will probably help a small amount

 

[andar 10+ year member]

http://www.offroad-tech.com/tech/gmbigalt/

article on how to install an Iraggi alternator into chevy trucks, along w/ dominick iraggi's phone and email

 

[audiolife 5,000+ posts]

i would get an alt 90-130 amp do the big 3 and get a kinetik 1800 or simular sized/spec battery http://www.sonicelectronix.com/item_7342.html solid battery that wont get killed if you need to give/get a jump start and has alot of reserve.