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headlights dim with cap. NEED HELP

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Old 03-12-2008, 12:45 PM
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headlights dim with cap. NEED HELP

Ok since the best buy and all the other big stores around here suck with Audio i bring my question to you guys. I have 2 10" subs and an amp and a cap in the back of my car and When the bass hits hard at night my head lights dim a little. I bought the cap to fix this but i guess it does not. What els can i do?
Also what is a good brand of speakers to put in my car? I have sonys xplode in there now and i dont like them. for subs I have Kenwood same for the amp and my deck is sony (only because it was cheep and has a usb hookup )
Old 03-12-2008, 12:52 PM
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i am not a big audio guy, but an audio battery might help. something like a yellowtop. as far as good speakers, i could only recommend the major brands (rockford fosgate, alpine, jl audio, memphis, resonate engineering, etc.)
Old 03-12-2008, 12:53 PM
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Originally Posted by hinow41
Ok since the best buy and all the other big stores around here suck with Audio i bring my question to you guys. I have 2 10" subs and an amp and a cap in the back of my car and When the bass hits hard at night my head lights dim a little. I bought the cap to fix this but i guess it does not. What els can i do?
Also what is a good brand of speakers to put in my car? I have sonys xplode in there now and i dont like them. for subs I have Kenwood same for the amp and my deck is sony (only because it was cheep and has a usb hookup )
Boston Accoustics speakers are sweet, pricy but verry good, as for the power problen you may need a bigger altranator, or try to adjust the amp so the bass dose not hit so hard.
Old 03-12-2008, 12:53 PM
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maybe you need a bigger cap? ...and a more hardcore battery!
Old 03-12-2008, 01:54 PM
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A cap wont really help
How long is your ground?
What size wire are U using
A bigger Batt. might help, but replace the stock batt. ground with a thicker one (0/1 guage)
Make sure your using at least 4 gauge wire and your ground is no bigger than 24 inches, sand the paint away from wherever your ground is
Try grounding the amp right to the same ground as the batt.
Old 03-12-2008, 01:55 PM
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How many Farad's is your cap?

I think mine is a 5 farad, and I'm only running the OEM 10"

Overkill, yes. But way easier on the entire electrical system.
Old 03-12-2008, 07:33 PM
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Ok if I buy another battery I can just hook the cap up to it. Wouldn't that drain that battery quick?
Old 03-12-2008, 07:37 PM
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Originally Posted by hinow41
Ok if I buy another battery I can just hook the cap up to it. Wouldn't that drain that battery quick?
not a separate battery, a replacement battery for your OEM one. like others have suggested, Optima Deep Cycle Yellow Top
Old 03-12-2008, 07:43 PM
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How big is your amp? Might be overkill for two xplodes and thats prob why you dont like them besides the fact that they suck. Does it do this all the time or just at idle? Your alternator should be putting out plenty of juice to run those subs, if it does it a little at idle I would understand but not at speed.
Old 03-12-2008, 07:45 PM
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Caps don't help.

Get a yellowtop.
Old 03-12-2008, 07:46 PM
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Get an optima yellow top... read this thread about it that I started.

https://www.cobaltss.net/forums/electronics-audio-video-49/can-i-replace-stock-battery-optima-red-yellow-top-100142/
Old 03-12-2008, 07:47 PM
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help us out and give us model #'s of the amp and subs that you have now.

i would bet the gain on your amp is cranked which is not good, give us some info.

as far as speaker go everything is subjective, what is good for me, may not be good for you, best advice is to listen to different brands in other peoples cars if you can
Old 03-12-2008, 07:50 PM
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With my last system, I tried all the above, and what fixed it for me was a high output alternator. Get your's rewound to a higher amperage, or buy a new one...
Old 03-12-2008, 08:06 PM
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same **** with me.. i just turned down the gain on the amp... less power, but fixed the dimming
Old 03-12-2008, 08:36 PM
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Originally Posted by daedlus
With my last system, I tried all the above, and what fixed it for me was a high output alternator. Get your's rewound to a higher amperage, or buy a new one...
this is definately the weak point in the system I was surprised to find out that our stock alts are only like 105 amps, this is dissapointing, my '01 alero was 140 amps and never had an issue, i only run 700 quality total watts.

Originally Posted by cobaltguy88
same **** with me.. i just turned down the gain on the amp... less power, but fixed the dimming
good for you dude

rule number one. your gain is not a volume knob

maybe the mods will want to post this link as a sticky, i would only be quoting from it if i wrote a post myself.


http://mobile.jlaudio.com/products_a...php?page_id=30

Last edited by pik; 03-12-2008 at 08:36 PM. Reason: Automerged Doublepost
Old 03-12-2008, 08:48 PM
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KFC-W2511 10" Subwoofer I have 2 of these And this is my amp Kenwood KAC-8103D
1000W Class D Monoblock Amplifier

And I dont know what kind of cap it is i forgot I bought it from some one off the site here is a pic

Old 03-12-2008, 09:12 PM
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check the gain setting, if those are 4ohm subs, and from what i've seen they are, they are prob wired to 2 ohms. at 2 ohms that amp will do 500w rms, it has 1 40 amp fuse, no way even at max juice that should be a problem. check your grounds, ground should be as short as possible, secure and on bare metal.
Old 03-12-2008, 10:53 PM
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I have the ground going to the neg of the battery. Is that bad?
Old 03-12-2008, 10:55 PM
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Ive just always grounded to the frame, thats where the battery is grounded also so that probably is increasing the length of your ground wire in theory I guess..
Old 03-12-2008, 11:03 PM
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i would hook the ground line onto the frame...mite do the fix. when i do my systems i hook it to the frame
Old 03-13-2008, 12:01 AM
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if it is on the battery terminal, i would move it to where the battery is grounded to on the car
Old 03-13-2008, 05:37 AM
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take the cap out and run the 4g all the way to the amp, redo the ground with 1/0, replace battery with carquest NGT extreme or other AGM style deep cycle, replace battery terminals
Old 03-13-2008, 01:48 PM
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Ok I went down to a local store and they want $200 for the yellow top battery.... and they told me that I need a bigger alt... So yeah i'm going to try that hole ground thing to see if thats the case.
Old 03-13-2008, 06:46 PM
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hey optimas are expensive hence why i dont recommend them
Old 03-13-2008, 08:39 PM
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is there a good place to get a high output alt because i have 2 yellow tops and 2 caps and my lights dim lol


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