battery selection optima??

[nudge701]

hey all im in the market 4 a more powerfully battery for my car mainly for my stereo coz the lights flash at high volume and it restricts how load i wont it i was thinking bout getting an optima battery but not sure how many cca's i will need i was looking at one that is 750cca will this be overkill or just perfect. all help is grateful i drive a 89 vn btw
cheers all

[nudge701]

im also wodering about a better more powerfull alternator but no idea wat 2 look for

[Philthy]

D34 is the usual replacement for a commodore.
How big is your stereo? Your lights dimming might be caused by a simple wiring issue

[nudge701]

iv got 2 amps, a 4 channel and a big mono block 1600watt option audio sub 2 farad capacitor. stock vs speakers in the doors (atm) and sumtin else in the rear but im changing those 2 option audio aswell and the lights only dim at high volume but my stereo can go much much louder but i dont wona blow anyfin so i keep it down so nufin dims. all the wiring for the stereo has been replaced with new stuff so basically nufin in my stereo is stock apart from the from speakers lol. i was looking at the d34 will 750cca b powerful enough

[Philthy]

What size wiring are you using, have you upgraded the earth wires in the engine bay, and how well earthed are your amps? I assume you mean 1600wrms

Yes the D34 will be powerful enough

[nudge701]

yer wrms lol havent done the engine bay just yet its all still a working progress amps are earthed fairly well iv only just getting this problem since i got the new option audio amp in so i instantly thought a more powerful battery

[nudge701]

oh and im using 4gauge wire

[acarmody]

I don't think 4 gauge will run 1600wrms properly, I would upgrade that.

Also what is the 4-channel amp running if you have stock door speakers?

[Philthy]

Use the biggest power and earth wires your amps can handle, then use at least 4 gauge wire for your battery-to-chassis, engine-to-chassis, and a bigger alternator-to-battery wire. Chances are your dimming will be solved

[nudge701]

I don't think 4 gauge will run 1600wrms properly, I would upgrade that.

Also what is the 4-channel amp running if you have stock door speakers?

4 gauge is the biggest my amp can handle im also using 8 gauge power cable from sub 2 amp.
the 4 channel has front and rear speakers on it with the stocky front doors speakers on the amp i dont get distortion as much with them on the amp as u would on the headunit

[nudge701]

Use the biggest power and earth wires your amps can handle, then use at least 4 gauge wire for your battery-to-chassis, engine-to-chassis, and a bigger alternator-to-battery wire. Chances are your dimming will be solved

cheers mate ill do that do u rekon i should still get a bigger battery?

[acarmody]

Do the cabling first and see how it goes. If it still plays up then you can look at the battery.

[nudge701]

i think ill still get the battery lil extra power wont hurt. cheers for the help guys

[iaydemir]

Hey, i had the exact same issue in my VY. I got the yellowtop Optima and the issue no longer exist's. The lights dim when bass kicks in.
Also the standard battery was constantly charging and it kept eating away my alternator bushes, eventually the bushes wore out and alternator stops working all together, can really give you the shits.

[acarmody]

Hey, i had the exact same issue in my VY. I got the yellowtop Optima and the issue no longer exist's. The lights dim when bass kicks in.
Also the standard battery was constantly charging and it kept eating away my alternator bushes, eventually the bushes wore out and alternator stops working all together, can really give you the shits.

Doesn't matter what battery you have, the alternator still has to produce the exact same amount of power to recharge it. If your audio system takes 1kW/h, then your alternator has to charge back 1kW/h.