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Thread: Need to find acc wire that stays alive during crank.

  1. #1
    Variable Bitrate
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    Need to find acc wire that stays alive during crank.

    I'm using a Jeff Mucha shutdown controller and for the "aux" wire I'm going to use the accessory switch wire which goes to my headunit but this wire does not stay alive during cranking. I'm assuming this would cause my system to shutdown when I crank. I don't know where I could find an accessory wire that would stay hot during crank. What is the solution for this?

    Upon taking apart the steering column I can see that there are six wires plugged into the ignition barrel thing, but I don't know what any of them are and I don't have a multimeter, I only have a circuit tester so I can only test to see if the wire is hot or not.

  2. #2
    MySQL Error MatrixPC's Avatar
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  4. #4
    Variable Bitrate
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    Not going to happen...... for tank circuits surving cranks!! Your going to need to build like a tank circuit or buy an OPUS that is the only way to survive a crank!!!
    New CarPC on the way again I think. I miss my old one!!!

  5. #5
    Variable Bitrate
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    Quote Originally Posted by R3l0ad
    Not going to happen...... for tank circuits surving cranks!! Your going to need to build like a tank circuit or buy an OPUS that is the only way to survive a crank!!!
    Umm, I will have a tank in place, but if my accessory wire goes low then it will tell the shutdown controller to send an atx pulse to turn the computer off. Thus my computer will shut down during crank, not due to a loss of voltage but due to the shutdown controller losing +12V on the "aux" line.

  6. #6
    FLAC robiewp's Avatar
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    IGN (ignition) found at the ignition harness. On when the car's on, off when the car's off. through cranking and whatnot.

    only use this for switching a relay!
    car computer rev 5: 8" lilliput and usual suspects

  7. #7
    Variable Bitrate
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    Quote Originally Posted by robiewp
    IGN (ignition) found at the ignition harness. On when the car's on, off when the car's off. through cranking and whatnot.

    only use this for switching a relay!
    How about for switching a shutdown controller, is that acceptable use? And can you specify more where this can be found exactly?

  8. #8
    MySQL Error MatrixPC's Avatar
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    Read the thread on the link I posted earlier. Combine the ACC and IGN wire together. That will do the trick.
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  9. #9
    FLAC robiewp's Avatar
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    BALLS! i misspoke. the IGN wire is not on all of the time, only when the engine is.

    Matrix, in my car the ACC switches off before the IGN switches on. if you turn the key fast were talking sub 50ms, but there's a state where the key has turned off accessory but not turned on IGN, and depending on how slow you turn the key could be long enough to cause a problem. I know it would trip a simple relay. How do you counter this?
    car computer rev 5: 8" lilliput and usual suspects

  10. #10
    Constant Bitrate ncamara's Avatar
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    How about running a wire from the battery?

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