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Thread: Is it OK to ground my PC to the Head Unit Ground wire?

  1. #1
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    Is it OK to ground my PC to the Head Unit Ground wire?

    Hello all,
    Im putting together my first CarPC, and I'm about ready to install everything. I plan on leaving my head unit installed and running the computer through the auxillary in port of the head unit.

    I've read some posts about ground loop noise, and I was wondering if I can avoid all that by just grounding my CarPC to the ground cable on the back of my head unit. Has anybody done this? (yes i did a search for this very thing on the forum) or is this a bad idea?
    Any feedback is appreciated. Thanks.

  2. #2
    Maximum Bitrate XxAndyxX's Avatar
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    Make a good metal contact on you car, and ground to that. I wouldn't ground anything to the frame of the head unit.

  3. #3
    Fusion Brain Creator 2k1Toaster's Avatar
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    I think he means the itty bitty wire that goes to a ground from the HU correct? If so, then the answer is no. Way too small of a guage. But trace that wire down to the chassis, make sure it is free of crap, and ground there.
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  4. #4
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    Quote Originally Posted by 2k1Toaster View Post
    I think he means the itty bitty wire that goes to a ground from the HU correct? If so, then the answer is no. Way too small of a guage. But trace that wire down to the chassis, make sure it is free of crap, and ground there.
    That is correct, and hey, great idea on just tracing it down to the chassis, for some reason I didn't even think of that, I will do that, as long as I can trace the wire. Grounding in the same spot should eliminate and ground loop noise issues correct? (Still have to worry about RF interference and such though.)

  5. #5
    FLAC greatwhite's Avatar
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    Quote Originally Posted by cbutters View Post
    That is correct, and hey, great idea on just tracing it down to the chassis, for some reason I didn't even think of that, I will do that, as long as I can trace the wire. Grounding in the same spot should eliminate and ground loop noise issues correct? (Still have to worry about RF interference and such though.)
    Maybe, but not always. Grounding to the same point as the HU is a good start.

    Try your install first and see where it goes from there. What you're trying to do with a common ground is equalize the "affinity" to ground so one component is not trying to ground through another thus inducing noise.

    Ground loops can crop up for the weirdest of reasons sometimes...............
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