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Thread: Ground loop/alternator whine - Opus 250w

  1. #21
    Constant Bitrate notion's Avatar
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    Hi Will,

    The PSU and the PC chassis are grounded via a short heavy guage threaded cable to a paint stripped bolt that I drove into the car chassis myself.

    So you think the solid core could be creating a large part of the problem?

    Joel
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  2. #22
    Who am I? HiJackZX1's Avatar
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    Quote Originally Posted by Will Albers View Post
    Im surprised no one caught this. House wiring is for the home. Solid core wiring is designed for AC (high voltage, low amperage.) You want to use traditional car audio power wiring which is multi strand (DC, low voltage, high current). You are starving your power hungry components.

    Now, ground the chassis of the PSU to the PC chassis. It should be grounded already if the unit is screwed in but check and make sure. Ground the chassis of the PC to the same grounding point. Did you remove the paint at the grounding point? Is the grounding bolt in a solid piece of metal or attached to a convenient tack welded panel?

    Then follow my thread on eliminating ground loops.
    OMG, I mean who would dare use house wiring..... I guess no one noticed because we assume most people know better......

    Also were is the PC located? If its in the rear, I suggest looking for the bolt that attaches the rear seat to the inside of the trunk and sand it like crazy.... until you see nothing but bare metal on the bolt and hole..... Also make sure your ground is as short as posible. It should only be about 3 to 6 ft max length. If that fails look for a ground point that the manufatuerer uses. For my truck I used a factory ground point, and have no issues. I also installed a system in my little brothers car but did the first step and all is fine.
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  3. #23
    FLAC
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    Quote Originally Posted by notion View Post
    Hi Will,

    The PSU and the PC chassis are grounded via a short heavy guage threaded cable to a paint stripped bolt that I drove into the car chassis myself.

    So you think the solid core could be creating a large part of the problem?

    Joel
    Joel, its tough to say. In the world of troubleshooting, its always best to eliminate variables. That power flow is variable number 1 and easially solved.

    Plug a pair of headphones into the PC output. Do you hear the noise? If so, its a bad component or power supply.

    Have you tried a ground loop isolator? Does it solve the problem?

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