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Thread: WTF? Opus works without ground - I dont get it

  1. #1
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    WTF? Opus works without ground - I dont get it

    I was messing with my setup today to try and see if I could eliminate my grounding issues, and I had the ground off the opus. I was surprised to see the opus was still lit up and powering the USB bus. Figured it was just residual power, but it didn't go off. So out of curiosity, I jumpered the BAT to the IGN and the computer started right up! I don't get it, how is it running without a ground?

    Dan

  2. #2
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    any part of your case touching the car's chassis? Or perhaps the metal opus casing?

    I know sometimes the casing of those things is connected to the ground.

  3. #3
    See me in my wet t-shirt. stevieg's Avatar
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    It could be finding ground a number of ways. It is likely to be through the sheilding (ground) on the audio cables.
    Ford Focus MP3 : www.stevieg.org/carpc Blog Updated 29 January 2009!
    Car PC Status: Complete - Undergoing Software Redevelopment

  4. #4
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    Wow! That's scary! It was grounding through the VGA cable! Ugh, on goes the search for the grounding problems.

    Dan

  5. #5
    See me in my wet t-shirt. stevieg's Avatar
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    This can happen EVEN IF you have a direct ground connection, and in fact is the common cause of grounding issues.

    You need to ensure the route to ground on your actual ground cable is a lower resistance than any other paths to ground. As you probably know, it's usually achieved by having a short, fat, ground cable bolted to the chassis, that has the paint removed around it to ensure good good contact.
    Ford Focus MP3 : www.stevieg.org/carpc Blog Updated 29 January 2009!
    Car PC Status: Complete - Undergoing Software Redevelopment

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