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Thread: Engine Whine when air con is switched on.....

  1. #1
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    Engine Whine when air con is switched on.....

    Hi Guys,

    I have just registered at mp3car.com. I hav an issue with my rear speakers giving a whine when i switch the A/C on. I have read through the various threads n posts on this issue and have done most of it.

    I just got all wiring changed from the previous one to monster cables. However, the engine whine is still there.

    Just to give you an idea of how it all started. Initially I was running a 2 x 12" Subs with a Westcoast custom Amp. I did not have any noise or whine. I decided to install a second Amp for the speakers when I changed em. There we go started the whine. After hours of switching wires I found out that it was the newly installed rear speakers that are giving this whine which increases on acceleration.

    Based on findings from mp3car.com I moved all RCA cables to run via the leftside and power cables through the rightside. Grounded both Amps at the same place but the moment I switched the a/c on the whine is back and it is very annoying.

    Please help...

  2. #2
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    Hey guys .... anyone has any reply for me?

  3. #3
    Fusion Brain Creator 2k1Toaster's Avatar
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    well this is a CarPC forum, not a general audio forum.

    But sounds to me like you dont have sufficient guage power cable to your amps.
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  4. #4
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    I agree that it is possible that your wiring might be inadequate. Also, your alternator may be taxed to capacity.
    Da_Kooz

  5. #5
    Constant Bitrate thewizard's Avatar
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    It sounds like a ground loop to me. I bet that a ground loop isolator would get rid of the whine, but that is only a band aid fix. You need to find the source of the loop to fix it properly and permanently. Some amps are much more susceptible to this than others, so yes it is possible to get noise from one amp and not the other.

  6. #6
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    Hey Guys,

    Thank you all for you replies. I have a 10 gauge power cable to the first amp and a 4 gauge cable to the second one. I will have this changed to 10 gauge for both... I'm not sure if this is going to help in anyway..My ground loop isolater is on its way from the states. I will have that put in place when i get it. But yes, otherwise i have tried all the possible options, like changing the cables, separating RC cables n the power cables, grounding at the same place n stuff... but it seems to remain... So other than getting the ground loop isolator installed I cant think of anything else... may be u guys can suggest...


    oh by the way... when i joined at mp3car.com n started runnin thru threads i did not notice the fact that this is carpc forum.. sowie abt that... was in a bit of hurry coz of the given situation n wanted help as quickly as poss..... next time ill def take care of the forum....

  7. #7
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    I'm having the same problem. I have a minor popping sound I noticed in my subs when I adjusted the volume. After installing an amp to power the mids/highs I got alternator whine in the speakers. I'm going to try remedying this by disconnecting the head unit from it's current source and running a ground wire off the same location the amps are grounded to.

    Check this out:
    http://en.wikipedia.org/wiki/Ground_loop_(electricity)

  8. #8
    Fusion Brain Creator 2k1Toaster's Avatar
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    10awg is smaller than 4awg.

    And do you have 2 separate cables running all the way from amp to battery, or do you have 1 cable from the battery that is split somewhere?
    Fusion Brain Version 6 Released!
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  9. #9
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    yes i have separate power cables running from the battery to each of the amps. the power cables r runnin through the left side n the rc through the right....

    the only difference is tha 1 is a thick wire (4 gauge) and other thinner one (10 gauge). am not sure if this plays any role in the engine noise....

    i have two pairs of HID xenonz, one 2 amp capacitor, one 800 watt amp, one 450 watt amp, the head unit, two subwoofers, all powered by a single battery..... i dont know if these would draw too much electricity from the battery that the second amp is not getting enough charge...

  10. #10
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    Quote Originally Posted by shabz34526 View Post
    yes i have separate power cables running from the battery to each of the amps. the power cables r runnin through the left side n the rc through the right....

    the only difference is tha 1 is a thick wire (4 gauge) and other thinner one (10 gauge). am not sure if this plays any role in the engine noise....

    i have two pairs of HID xenonz, one 2 amp capacitor, one 800 watt amp, one 450 watt amp, the head unit, two subwoofers, all powered by a single battery..... i dont know if these would draw too much electricity from the battery that the second amp is not getting enough charge...
    You have a capacitor? Wouldn't it be better then to locate the cap beside the amps in the back if you haven't already, run 4g wire directly to it, and then 4 or 10g wire from it to each of your amps instead of 2 separate runs? Then ground the cap's (-) with a short grounding cable and run the Amp grounds off it. Maybe you could use that 10G run you're no longer using to supply ground to the deck. That way everything's grounded at the same source.

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