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Strange power hiccup on m2-atx when turning my car off.

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  • Strange power hiccup on m2-atx when turning my car off.

    I recently changed my car PC installation over to another motherboard and as a result changed my power supply back to the m2-atx. Keeping all the components (Power, USB etc) the same i figured it'd be an easy deal. I am now having a problem that i really dont know where to begin troubleshooting. Basically the power to my car PC dips down to <9volts whenever i take my key out of the ignition. It only happens for a second before the multimeter jumps back up to 12v, but its long enough that the m2 cant compensate for the dip and keep my system alive. I can hear the processor fan speed slow for a second before it picks back up and the computer reboots.

    The thing thats kinda baffling me is this really shouldn't be happening. Both of my batteries are less than a year old and the auxiliary battery powers nothing but the car PC and a single (but new) amplifier. I never run the system with the engine off and both batteries still test fine. So where should i start checking? Could a loose wire cause the problem? Again, i'm using all the same wiring, same battery isolator etc. What could cause a dip in detected voltage from a healthy battery?
    Last edited by Sonicxtacy02; 05-27-2011, 08:14 AM.
    mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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  • #2
    so if you turn the ignition off, but keep the key in, the power stays around 12v? but as soon as you pull the key out, it momentarily drops?

    i wonder if it is a worn ignition assembly causing a brief short.
    My OLD 2001 Mitsubishi Eclipse GT:
    "The Project That Never Ended, until it did"


    next project? subaru brz
    carpc undecided

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    • #3
      actually i was wrong.. i just did tests, the power dips when the ignition is turned off, regardless of the key still being in the cylinder.
      mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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      • #4
        ok, does the power also dip when you turn the ignition on?(if something is shorted inside the ignition)

        it really sounds like a car problem more-so then a pc issue...(maybe check your cars forum, or a local dealership?)
        My OLD 2001 Mitsubishi Eclipse GT:
        "The Project That Never Ended, until it did"


        next project? subaru brz
        carpc undecided

        Comment


        • #5
          Yes, it also dips during crank. I figured it had to be something with the PC because i never had such problems with my prior motherboard and DSATX power supply
          mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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          • #6
            not while the motor cranks, but as you are turning the key from 'off' to 'acc', or 'run'
            My OLD 2001 Mitsubishi Eclipse GT:
            "The Project That Never Ended, until it did"


            next project? subaru brz
            carpc undecided

            Comment


            • #7
              Going from acc to on is fine
              mp3Car.com Senior Tech Blogger (Want a product reviewed? Contact me.)
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