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  #13  
Old 09-13-2011, 08:09 AM
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Re: Interior lights dim slightly when sub hits

Quote:
Originally Posted by cheapjeep View Post
Get heavier gauge wire.The alts in any newer Jeep especially a v8 have more than enough power to run any reasonable system.
That is correct. If memory serves, the standard is 160amps
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  #14  
Old 10-10-2011, 02:06 PM
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Re: Interior lights dim slightly when sub hits

First question though... If the interior lights are dimming, that means they're on. So are they on while you're driving or when you are parked with doors open and the engine just idling? If so, then the problem is the alternator is not charging at full current and the battery will discharge much quicker.

If it's happening cruising down the road with the visor light on, the battery is slowly dying. So while you may be running 14+ volts, the system is now causing more draw than the battery can hold.

Gotta disagree with you guys while also agreeing whole-heartedly...
A .5-1 farad cap in this case should fix the dimming (which will NOT fix the problem!).
In most smaller setups, a capacitor will help the system, they are designed to charge quickly & discharge instantly. So while they do add strain to the electrical system, they also ease it when played at low to moderate volume. BUT, when you beat your subs to death, a cap is a cancer to the system. So if that's what you're doing, you need to upgrade the battery first. An OEM type battery provides a lot of cranking power, but only average ampere-hours (steady draw power). If the amp is under 500 watts (12W3v3 needs 300w & warranty is voided at 500w), then a 2nd battery & isolator is overkill. If you still have issues with a better battery, then there is likely a current draw somewhere in the system that needs to be addressed.

I don't bother with a cap on my system b/c it would be useless, when mine's turned up, the lights give up. LOL
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  #15  
Old 10-12-2011, 01:32 PM
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Re: Interior lights dim slightly when sub hits

Remmy hit it on the head as did the guy who agreed with him lol. Although Id bet its probably not an amp inefficiency as much as it is the big 3. Def check out your ground though and make sure you have at least 4guage or bigger amp kit w/ your setup. Also you say high up 18-20 how mcuh % is that of your total HU output?

Id bet that signal is heavily clipped at that level (specially if lights are dimming) and you are probably going to ruin the amp and in turn the driver. Id be careful with that and in all honesty, see if you can find someone with an o-scope and have them check out the amp sine waves with a test tone cd and then have em set the gain accordingly for the volume levels you listen at. This will make sure you CANNOT ruin your expensive equipment by clipping the signal at the amp in turn sending clipped signal to the sub which will ruin that via overheating etc.

Beyond that they guys hit the nail on the head - The BIG 3 WILL SOLVE this issue. That's what the majority of peoples system issues boil down to. The factory wiring just inst large enough for aftermarket demands so going up to 1/0 gauge will solve most power handling problems.

FWIW - FORGET CAPS. Thats a last resort for most street systems. They're really for SPL comps as mentioned, just for huge power needs of competition levels. They wont really solve your problem, maybe in the short term but they certainly wont stop you from ruining your entire system. GL with your setup and PLEASE PLEASE, have a shop check your gains on your amps with an oscope or DMM at least.
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  #16  
Old 10-12-2011, 06:26 PM
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Re: Interior lights dim slightly when sub hits

Thank you for all of the information guys. My ground is solid and I believe that I am running 0 gauge amp wire to feed the system. The dim is very slight and the only reason I noticed it was I was looking at a piece of mail with the overhead lights on and my music playing.

I have also noticed that the interior lights (during the same scenario) dim when my blinkers are turned on or any additional draw is put on the electronic system.
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  #17  
Old 10-13-2011, 10:16 AM
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Re: Interior lights dim slightly when sub hits

sounds like not really an issue then just something you've noticed. But if it becomes a problem just read and do this, any dim you've seen will disappear for sure. If not then yeah you likely have a bad ground somewhere in the system or the battery is on its way out.

http://forum.sounddomain.com/ubbthre.../312025/page/1
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