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Thread: yet another wiring/power issue

  1. #1
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    Nov 2000
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    Augusta GA
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    yet another wiring/power issue

    Hey yall, I'm in a bit of a fix here, as I have to have this up and running by monday, so if anyone could point me in the right direction ont his I'd be much appreciative. I did try searching and read several thigns so I have a few ideas of whats going on but wanted to know what the impact of my particular setup would be.

    I'm using a Via EPIA m13000 mobo with the onboard sound. Xenarc 7" LCD.

    I'm using the 16 gauge power wire to run to the m1-atx 90w DC/DC PSU thats integrated into the ampie case.

    Now, the way I have it wire currently, is a direct power and direct ground off ring terminals directly from the battery back to a relay at the psu, then from there it goes out of the relay into the computer.

    There is no ground after the relay, the ground is done at th ebattery as I assumed that this would be a bettery ground than fooling with bare metal and the general chassis grounding. (I am aware this coul dbe my problem but want confirmation and solutions if it is)

    Essentially what I'm getting is classic alt whine when engines running, and I can hear the Hd and internal case fan spinning through the speakers, I bypassed my RCA wires and ran directly to the aux. in at the factory radio and still get it. Tried another audio source (ipod) and dont get this so its obvuisly the computer.

    Solutions are definatleyt apprecaited!
    2005 Subaru Legacy GT, carputer in progress
    Current status: Phase 1 Complete: working in car with no bugs, Phase II started, screen out of dash, making working mockup for beta testing

  2. #2
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    Join Date
    Nov 2000
    Location
    Augusta GA
    Posts
    50
    yea.. thanks.. ya know I need this up by monday. I'm going to have to just not use it I guess.. I rarley post anyway cos most of the info I need is already here, but when I do post apparently it just gets ignored. yes I searched I discussed this with other people but whats throwing me off is whether or not the relay changes things at all.
    2005 Subaru Legacy GT, carputer in progress
    Current status: Phase 1 Complete: working in car with no bugs, Phase II started, screen out of dash, making working mockup for beta testing

  3. #3
    Newbie
    Join Date
    Apr 2005
    Posts
    44
    Quote Originally Posted by DarkFox1
    Hey yall, I'm in a bit of a fix here, as I have to have this up and running by monday, so if anyone could point me in the right direction ont his I'd be much appreciative. I did try searching and read several thigns so I have a few ideas of whats going on but wanted to know what the impact of my particular setup would be.

    I'm using a Via EPIA m13000 mobo with the onboard sound. Xenarc 7" LCD.

    I'm using the 16 gauge power wire to run to the m1-atx 90w DC/DC PSU thats integrated into the ampie case.

    Now, the way I have it wire currently, is a direct power and direct ground off ring terminals directly from the battery back to a relay at the psu, then from there it goes out of the relay into the computer.

    There is no ground after the relay, the ground is done at th ebattery as I assumed that this would be a bettery ground than fooling with bare metal and the general chassis grounding. (I am aware this coul dbe my problem but want confirmation and solutions if it is)

    Essentially what I'm getting is classic alt whine when engines running, and I can hear the Hd and internal case fan spinning through the speakers, I bypassed my RCA wires and ran directly to the aux. in at the factory radio and still get it. Tried another audio source (ipod) and dont get this so its obvuisly the computer.

    Solutions are definatleyt apprecaited!
    Just an idea, but you could try grounding the shielded part of the RCA running from your pc to the input on your head unit. I did it on the head-unit side and it solved my alternator whine. Sometimes the head units have crappy grounds.


    -Josh

  4. #4
    Newbie
    Join Date
    Nov 2000
    Location
    Augusta GA
    Posts
    50
    Thanks for the info, we worked on it all day, it took a ground loop isolator.. after moving the ground several times, before it was finally fixed. I know this usually represents another problem, but after that it was the best thing we could do to get it acceptable at least for the time being.
    2005 Subaru Legacy GT, carputer in progress
    Current status: Phase 1 Complete: working in car with no bugs, Phase II started, screen out of dash, making working mockup for beta testing

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