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Thread: Induced noise/Ground loop trouble shooting guide.

  1. #101
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    had same problems , fitted a ground loop converter(or was it called an isolator,anyway) from my local maplin store. easy to fit and only a couple of pounds sterling, worked a treat.(fits to the earth cable between amp and earth connection to body of car.

  2. #102
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    Quote Originally Posted by Skipjacks View Post
    This looks to be my answer except for one thing...

    What 12v line do I put the noise filter on?
    It goes on the power wire into your PC.
    Car-mada-puter Epia MII12000, 40gig HD, 512mb ram, Morex 3688 case, M1-atx and XP Pro.

  3. #103
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    Ground loop trouble or not?

    Will, I read your thread on ground loop and found it very informative. I used your recommendations on how to detect and isolate the problem in my config. Thank you!

    I just installed a xm receiver in my auto by utilizing the factory options. I ran the antenna specific to Delphi's directions, connected the 12v power cord to a dedicated 12v cigarette outlet (car has two), and connected a 1/8" mini-plug from the line out on the receiver directly to the AUX input in the car. It was quite the easy install.

    Later after driving around a bit, I noticed alternator whine coming through the speakers. I isolated the problem down to the 12v outlet and contacted Delphi for a solution. They said this is common and that I needed a ground loop isolator. When I finally got down to thinking I wondered how to modify a ground loop isolator with rca connectors to what I need. Ridiculous!

    Maybe my only option is to rewire the 12v outlet (which may or may not disturb the vehicle's electrical system) or even run a third 12v outlet into my car. But before I do this, I would like to know if there are any products out there that may alleviate this problem without all the fuss.

  4. #104
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    Since I didn't see any point in making a new thread since I'm having the same problem I'll just throw it in here...

    I was having the same problem as everyone else, that little buzzing sound in the speakers from the amps... mine didn't change with the rpm btw... At first I figured out that it was because I had a cable extension between my 12-220V inverter and the computer so I moved it all to the trunk instead...

    The buzzing is now much lower but I wanted to get rid of it... so, reading this thread and many others I got a Ground Loop isolator and plugged it in between the pc and my amp...

    and when I turned on my inverter... well I had to turn it off since I was afraid it would blow my speakers, the noise was worse then ever...

    anyone else had this problem... that a GLI actually makes the noise worse?
    Swedish site for CarPC's
    http://www.bilpc.info

  5. #105
    Car Audio Moderator durwood's Avatar
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    Did you try to ground the chassis of your invertor? Invertors are notorious for inducing noise. Ground the chassi of your computer to the chassis of the invertor to the same ground as everythign else as your stereo system.

  6. #106
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    Quote Originally Posted by durwood View Post
    Did you try to ground the chassis of your invertor? Invertors are notorious for inducing noise. Ground the chassi of your computer to the chassis of the invertor to the same ground as everythign else as your stereo system.
    I think I managed to do that... I but a small loop between one of the screws in the chassis to the groundcable going into the inverter but it didn't seem to help... yesterday after I connected the cables to the front set of speakers I noticed that my screen was going crazy to... buzzing sound was much louder and the screen was flickering like mad...

    I tried using a extension cable from a power outlet and then I didn't have this problem, sound was amazing so I hope I can get rid of this problem and just start to enjoy my 5.1 setup...
    Swedish site for CarPC's
    http://www.bilpc.info

  7. #107
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    Hi,
    Ok so its been a while, as most of you know i am using the XMD1000 and am gettting ground noise in the line in.

    I tried grounding the XMD chassie as most of you suggested and still no difference. I am now using a computer with a DC to DC power supply. when I mute the line in it is perfect, it is also perfect with the line in unmutted, however as soon as I connect the XMD and it is operational it has a buz and hmmm..... i also get the alternator whine, what would u guys recommend!!!

  8. #108
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    I have gone through the exact same problem since I installed the XMD. Grounding the chassie worked partially, but I still had some noise. I finally took the cable apart and found that the ground in the cable at the serial connector wasn't very good. I resoldered it and it made a very big difference. There still is a very slight whine but is 10x more tollerable than before.

    Just saw this. It may be the solution
    http://store.mp3car.com/ProductDetai...Code=SAT%2D007
    Car-mada-puter Epia MII12000, 40gig HD, 512mb ram, Morex 3688 case, M1-atx and XP Pro.

  9. #109
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    Jan 2007
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    a question for RedGTiVR6

    Hello mate,

    I am a bit of a novice at all this stuff but have still managed to fit a freeview tuner and DVD/Divx player into my Mk4 Golf GT TDI 150 (both display onto MFD). However, I am getting background noise. I have a ground loop isolator but am not sure where each wire attaches.... stupid i know! Could you please help with either a diagram or by posting where each of the four cables attach (Red and black input And Red and black output). Thanks

  10. #110
    Maximum Bitrate LinuxRacr's Avatar
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    I'm curious about this as well, as it is the latest problem that I must eliminate.
    My Car: 2001 Mazda MP3
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