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    des343's Avatar
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    lights dimming without serious voltage drops?

    Its a 95 blazer I believe 120 amp alt not positive no big 3 (yet) the build is a process due to funds so I upgrade when I can. I have 2 optima bats a yellow in front a red in back zero gage wire ran from front to back to amp. I don't have my full system in yet only 2 of the 4 subs amp only wired at 6 ohms to begin with when a heavy bass song is playing at the max volume I set the system for my voltages drop from 14.4 to 12.4 and no lower that I've seen yet my lights will dimm very heavy even though my voltages are not too bad...

    Why? What can I do more batts? I plan on a bigger alt but they are pricey and I need something to hold until then I've heard of battery isolators but know nothing about them or where to find them or if I even need it but I just don't want to get pulled over or **** someone off on the highway because my lights flashing at them...







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    Re: lights dimming without serious voltage drops?

    ??




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    Re: lights dimming without serious voltage drops?

    Thats plenty of voltage drop for lights to dim ..ive seen lights dim on .5 drop ..get a ho alt and or more batts..and optimas arent the best car audio batteries ..deka are alot more bang for the buck ...and battert isolator not needed




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    Re: lights dimming without serious voltage drops?

    And thats esp bad voltage drop for a 6 ohm load




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    Re: lights dimming without serious voltage drops?

    I'd consider 12.4 bad voltage drop. I personally consider anything under a battery's resting voltage bad drop, but that's just me. Regardless, you will definitely see lights dim where you are dropping to.

    What amps are you running/plan to run? That will pretty much determine if possibly another, or better, battery will suffice or if an alt is needed. But if you plan on getting 4 amps, plan on getting a HO alt, plan on more and better batteries, and plan on more wiring. Depending on amps of course.



    Quote Originally Posted by ducatipaso View Post
    15inch subs can't play fast beats, they take more power and that taxes the vehicles electrical system. You will wake up and "hear" then see the light at the end of the tunnel and it will be 3 10's pounding so hard you wont even open your trunk or turn your system on because you 15's will sound sloppy & weak.
    Quote Originally Posted by benbenondatrack View Post
    stfu lesbo.why are you worried about me so much? you must want to date me ya little cookie monster but i dont even like sweets. your just a cup full of ice, dirt dead nasty azz ice...without the water.

    Dat Build Log: http://mobileaudioforum.com/forum/showthread.php?2566-1999-Chevrolet-Blazer&highlight=1999+blazer

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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by gckless View Post
    I'd consider 12.4 bad voltage drop. I personally consider anything under a battery's resting voltage bad drop, but that's just me. Regardless, you will definitely see lights dim where you are dropping to.

    What amps are you running/plan to run? That will pretty much determine if possibly another, or better, battery will suffice or if an alt is needed. But if you plan on getting 4 amps, plan on getting a HO alt, plan on more and better batteries, and plan on more wiring. Depending on amps of course.
    Both of my batteries are at 12.4 resting. And where is a good place to get a fair price on a ho alt and to get actual batteries I don't wanna go broke tho is the thing




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    Re: lights dimming without serious voltage drops?

    How about start by setting the amp up right and make sure you have a good ground



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    Re: lights dimming without serious voltage drops?

    and do the big 3 kit as well, it's needed here ,also whats your budget on a alt ,i can help you there




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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by des343 View Post
    Both of my batteries are at 12.4 resting. And where is a good place to get a fair price on a ho alt and to get actual batteries I don't wanna go broke tho is the thing
    If u have a sams club near u their duracell agm are the same ***** as dekas..awesome batts cheap




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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by des343 View Post
    Both of my batteries are at 12.4 resting. And where is a good place to get a fair price on a ho alt and to get actual batteries I don't wanna go broke tho is the thing
    So again, what amps do you have and plan on getting? If you plan on getting decent sized amps, electrical is going to cost a lot, so you may want to rethink your amp decision.



    Quote Originally Posted by ducatipaso View Post
    15inch subs can't play fast beats, they take more power and that taxes the vehicles electrical system. You will wake up and "hear" then see the light at the end of the tunnel and it will be 3 10's pounding so hard you wont even open your trunk or turn your system on because you 15's will sound sloppy & weak.
    Quote Originally Posted by benbenondatrack View Post
    stfu lesbo.why are you worried about me so much? you must want to date me ya little cookie monster but i dont even like sweets. your just a cup full of ice, dirt dead nasty azz ice...without the water.

    Dat Build Log: http://mobileaudioforum.com/forum/showthread.php?2566-1999-Chevrolet-Blazer&highlight=1999+blazer

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    Re: lights dimming without serious voltage drops?

    Isn't 12.4 resting not good? Sounds like it needs a nice full charge.



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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by TreyE View Post
    Isn't 12.4 resting not good? Sounds like it needs a nice full charge.
    more like an electrical upgrade




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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by robert420 View Post
    more like an electrical upgrade
    More like the ground is bad and losing power or the alt is going out. I'm going with ground. He is running the amp at 6ohms. I cant think of a single amp running at 6ohms that would pull that much current



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    Re: lights dimming without serious voltage drops?

    Why? What can I do more batts? I plan on a bigger alt but they are pricey and I need something to hold until then I've heard of battery isolators but know nothing about them or where to find them or if I even need it but I just don't want to get pulled over or **** someone off on the highway because my lights flashing at them... [/QUOTE]

    i have never heard of someone getting pulled over for headlight dimming... along with pissing people off on the highway. because headlights don't dim very bad unless there's something wrong with your setup




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    Re: lights dimming without serious voltage drops?

    Quote Originally Posted by robert420 View Post
    more like an electrical upgrade
    Quote Originally Posted by DDtC View Post
    More like the ground is bad and losing power or the alt is going out. I'm going with ground. He is running the amp at 6ohms. I cant think of a single amp running at 6ohms that would pull that much current
    I took that as, when his car is off his batteries are resting at 12.4 volts. Ive always thought it should be at least 12.5-12.9 resting...

    I would double check ALL of your connections for wiring. I would disconnect batteries and check the voltage of each individually, you might have a bad cell in one of the batteries that is causing the extreme dimming (happened to me once). Also your ground, make sure your ground doesnt have any corrosion and the paint is stripped completely for metal to metal contact. Also make sure that you are grounding it in a correct location. There are plenty of stickies and threads around here to check where and how to ground properly. Good luck, sounds like something simple that can be fixed.



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