Question about 2007 Pontiac G5 Gt Coupe

3 Answers

Headlights flash with bass

I have a 2009 Pontiac G5 GT with aftermarket subwoofers, 2-12inch subs. So when I have the bass on loud the indash lights, mirror lights, and even headlights flash when the bass pounds. The subs are in the trunk and in this model so is the battery. The subs are hooked up to their own amp, and my stereo guy has assured me they are wired in properly.

Is this bad for the car? I have had the car for about 2months but have only noticed this issue in the last day or so. Should I be worried and get the car checked out?

Thanks for the replies....

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  • Abel003 Dec 08, 2008

    Thanks for the reply, that is definetely the problem. I have been reading on other forums saying I should buy a capacitor to help out.....



    Is that a good way to go? Or should I just buy a more powerful alternator....



    What are the price costs here?

  • Abel003 Dec 09, 2008

    Thanks wiz.....I am looking into buying a higher output alternator now.



    My stereo amp puts is 1000watts....and my stock alternator is 105amps....Will 130amp alternator be ok...or should I get higher like 140? or higher?

  • Anonymous Dec 19, 2008

    I decided to not put anything in. It is a brand new car, and GM's highest alternator they do is in there right now. If I put an aftermarket alternator in my entire warranty is void, so I am not going that way. I am not going to put a cap in either....cause it may not solve the problem either.

    I'm just going to keep a manual eye on it.... I am just hoping that it doesnt wear out my alternator that much quicker. If it doesnt affect the car too much than I am not going to worry about too much.

    I am not sure what class my amp is. The battery is brand new, brand new stock GM battery. I assume it was at full charge when I got it. I bought it at the end of October.

  • Lanc5r01 Apr 14, 2009

    I have a 01 lancer and have this same problem, i only have a 10 inch sub and its wired perfect, i was told at an car audio joint that my sub might have a short but not sure how to check that, might be time for a new amp.

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Look into a capacitor for your amp.

Posted on Jun 24, 2013

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So your lights flash. big deal. I have seen alot of guys get bigger alternators and stiffening caps. the battery in the trunk.. very nice.
seriously i think it might not be a simple one fix answer.. higher amp alternator may have higher cut in rate. you may need to rev higher to get the juice. are you using a d-class amp or a wasteful a-b class. you must have heavy wiring and in short lengths i hope.
what kind of battery do you have? when was the last time it was full charged.

throw on a charger if you have a decent battery. - optima.. or anything high amperage.. the battery is important the alternator should be ok.

look into a low cut in alternator. even of the same amperage

Posted on Dec 19, 2008

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  • Pontiac Master
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The sound system is exceeding the capacity of the Alternator, it takes allot of power to run the subwoofers, they make higher output alternators for just this situation, u will need one with at least 130 Amps output.

Posted on Dec 08, 2008

  • yadayada
    yadayada Dec 08, 2008

    It is the only option you have, u are most likely talking about $200-300

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Head lights flash when bass hits


your battery and/or charging system isnt strong enough to handle the load the 15" subwoofer is causing.

you will need to add a capacitor to your audio system.

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