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Thread: Connecting dc-dc psu to car help

  1. #1
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    Connecting dc-dc psu to car help

    Today I finally received an Opus 180w dc-dc power supply that I ordered from ebay. Since I come from a computer hardware background and not a car one, I am not familiar with this type of power supply.

    After reading the brief manual that opus provides, I attempted to hook it up to my car's battery (2003 chev malibu) assuming that the two wires that are the only loose ones would hook into the battery (red - positive) (white - negative?). When I touch the red wire to the positive battery terminal, a lound metallic beep is heard from that black box in picture 2. The motherboard does not turn on and the drives don't spin. Can any of you tell me whats going on?

    Here are some pictures of it:
    Power supply (without motherboard and drive connectors attached)


    Strange black box, maybe a fuse? It beeps when I connect psu to battery


    Thanks
    ---Craig

  2. #2
    Constant Bitrate meryan00's Avatar
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    I do not have an Opus to know 100% but usually the white line is for the Ign. +12v red is for battery +12v and black is for the ground, I might be wrong though.

  3. #3
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    Quote Originally Posted by meryan00 View Post
    I do not have an Opus to know 100% but usually the white line is for the Ign. +12v red is for battery +12v and black is for the ground, I might be wrong though.
    Thanks for your reply, but there are only two bare wires, a red and a white. It looks like the previous owner could have done some modifications to the wiring scheme because there is a lot of electrical taped up areas

  4. #4
    What can I say? I like serial. Curiosity's Avatar
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    That black box would be a relay. Not sure what it's connected to but the black wire coming from it and tied to a bunch of other black wires would be ground (negative).

  5. #5
    Maximum Bitrate bratnetwork's Avatar
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    if you don't know what the stuff does that the previous owner added on i would just cut it all off and start from the basic pigtail coming out of the PSU and wire it according to the manual...
    Yellow: Positive +
    Black: Ground (negative) -
    Red: IGN +
    Blue: Remote Output +

  6. #6
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    Ok. thanks everyone =)

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