Question about Car Audio & Video

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Alternator whine Here's my problem: I just finished installing my car audio system and everything was doing fine until 1 of my amps blew up. (it's the one powering my subs)and so i had it replaced. during the span of absence of the other amp, my systm suddenly developed a whine, I tried interchanging the amps but its no use. tried changing the grounding of the amps, still, no good. Re-route the wires? failed. it's really pissing me off coz i can't help playing my music at high volumes just to mask the noise. it irritates me so much i end up putting the stereo off instead. Please help me!

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  • 4A-FE Sep 17, 2007

    tried them, still there. went to a local audio shop, well, the noise lessened but didnt disappear completely. what if i ground the head unit and amp at the same point in the chassis?

  • 4A-FE Sep 17, 2007

    okey.. thanks later....

  • 4A-FE Sep 18, 2007

    still whines! and no wonder my first amp burned up, RCA's were damaged. i think i'd start re-wiring everything again? i already set my amp gains to minimum and still there's the whine. anyway, thanks for the advice pyroman. appreciate it....

  • TRIPCUZZ Dec 02, 2007

    I have the same problem. Tried all the above including the loop isolator. it helped but i can still here it. I'm thinking it maybe my head unit. One day i went to turn on my stereo and found that no sound was coming thru my speaker wires. the only way i heard any music was thru my 6x9s and subs simply because they hooked to amps. only my rca outputs produced sound signals and my speaker wires seemed to be shot. the only speakers that ran directly to the head were my door speakers. anyway, once all this happened, the whining started. IDEAS ANYONE???

  • MARGNOSIS3US Aug 26, 2008

    HI, I have the same problem but no solution yet.




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I have an alternator whine also i've checked, double checked, triple checked my wiring i've put in ground loop isolators, inline power filters with the alternator, i have 2 amps one is a brand new alpine 2-channel, tried new rca's, vehicle is a 07' chevy silverado classic any suggestions

Posted on Oct 28, 2009


I had the same problem. already rewire my whole system, but it didnt work. the only point of failure in my case was my HU and amp. since its easier to change the amp, what me and my installer did was try a known-good amp. several known-good amps. and all amps didnt produce that annoying alternator whine. so what i did was have my amp checked. after 2hours of repair, alternator whine already gone. the one who repaired my amp said that during the amp istallation, the (+) cable touched the body of the amp while the (-) cable is already connected to the amp. that caused one of the components inside the amp going bad. might as well have your amp checked. i can bet my life its the culprit on your case

Posted on Sep 16, 2008

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Try purchasing a "ground loop isolater", when your head unit and amp are grounded in 2 diffrent locations the diffrence in volatage to ground between the two will cause interference. Check the below link for more details, can be purchased of a shelf at you local radioshack loop&parentPage=search Hope this helps L8R

Posted on Sep 17, 2007

  • Patrick McGee
    Patrick McGee Sep 17, 2007

    That will definatly get rid of teh interfernece from the ground loop, go ahead and try that, get back to me if you still have some noise.


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