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Thread: HELP: Ground Loop Culprit

  1. #31
    Vendor - C&C CUSTOMS CabeSipes's Avatar
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    I understand what your saying. I think this weekend a may conduct a few experiments with MU metal and see what happens. If I have time that is.
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  2. #32
    Low Bitrate petec's Avatar
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    CabeSipes -
    My Car #1 CarPC is also a metal case with the M2ATX mounted adjacent to the MB in the case. You are saying that the alternator whine may be more related to the power supply than the shielded cable running to the HU AUX port?
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  3. #33
    Vendor - C&C CUSTOMS CabeSipes's Avatar
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    I have switched out every RCA cable and ground and sill have it. I have ran RCA's over he seats to deduct anything in the truck and its still there. I have unplugged all RCA connections an ran it into my eq, still there. Ran it straight to a headunit outside the car and it was there. It has to be the computer.
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  4. #34
    Car Audio Moderator durwood's Avatar
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    What soundcard are you using? Onboard or aftermarket? Is it there with headphones? If no, is the signal ground sharing the vehicle ground? If it is sharing vehicle ground I think you probably know about ground loop isolators or isolation transformers.

  5. #35
    Vendor - C&C CUSTOMS CabeSipes's Avatar
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    Using the onboard with the audio out 3.5mm jack being used for the output. No other jacks are being used and I tried a ground loop isolater and oddly it got insanely loud as if I had just amplified the noise.
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  6. #36
    Car Audio Moderator durwood's Avatar
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    During the delay or when I manually turn off the PC, the whining noise is most apparent.
    Does the whine go away after it has started or is it just less?

  7. #37
    Car Audio Moderator durwood's Avatar
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    Quote Originally Posted by CabeSipes View Post
    Using the onboard with the audio out 3.5mm jack being used for the output. No other jacks are being used and I tried a ground loop isolater and oddly it got insanely loud as if I had just amplified the noise.
    Ugh, onboard. They don't always implement a good ground scheme. Does the signal ground = vehicle ground? Check with a DMM. Try grounding the RCA shield to vehicle preferably at the source, does it get worse, better or stay the same? Or you could always try an aftermarket soundcard if you run out of options. It seems the majority of people with ground loop issues are using onboard audio but I could be wrong.

  8. #38
    Who am I? HiJackZX1's Avatar
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    There are just so many factors that can cause ground loops. I have rerun everything in my car. Number 1, I pulled out all the original speaker wire and replaced it. Also the new wire runs straight from the speaker to the AMP, rather then from the Speaker to the car harness then to the AMP. Basically trying to kill long wire runs. Second, make sure all your ground points are solid as h3ll. I redid all of mine to the direct chassis, except the carpc, instead I grounded that to the seat belt bolt which just so happened to have a plate that connects to the direct chassis. There is more you can do. I havent tested mine yet but I am confident the loop will be gone.
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  9. #39
    Variable Bitrate hailrazer's Avatar
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    Yea ground loops are a pain. In my Yukon install I have a whine until the Pc boots into Windows, then it's perfectly quiet. Tried everything possible, nothing helped. So I installed a switch that I leave off until Windows is up, then I flip the amps on.

    Now in my Kia I have the exact opposite problem. Perfectly quiet until Windows starts , then alternator whine. I have narrowed it down to the sound input on my external USB card. With no input plugged in I get no whine. With the HD Radio/Xm Radio hooked up through Mitch's Audio selector I get alternator whine. Unhook the input and just play sound through the PC or through the Dvd player and no whine.

    So tomorrow I get to narrow it down. Is it the Xm Radio or the HD radio causing it. It's not the audio selector because I get the whine with it removed.

    Oh boy the joys of ground loops. LOL

  10. #40
    Newbie technostar's Avatar
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    i had similar issue before that anything i plug in to my audio in port would make noise... i tried to use both 30amp car noise filter that connects from car battery to m2-atx and scosche rca ground isolator.... the one that worked for me is the scosche rca ground isolator...
    ...\...

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