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Thread: noobie power wiring question.

  1. #1
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    noobie power wiring question.

    so i bought the whole ampie carputer setup and im having issues with the wiring. on the power end it came with 3 vital wires (12v, ground, and ign) i hooked the ign to an external switch thinking that it would shut the comp down when it's disconnected. i was wrong...it just kills the comp. any suggestions?

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    are you sure you havent gotten the constant +12v and the ignition +12v mixed?

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    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by wrxeatr
    so i bought the whole ampie carputer setup and im having issues with the wiring. on the power end it came with 3 vital wires (12v, ground, and ign) i hooked the ign to an external switch thinking that it would shut the comp down when it's disconnected. i was wrong...it just kills the comp. any suggestions?
    The IGN line goes to the IGN or ACC line in your ride, not a switch. Wire it up properly and it might work properly, as well.
    Have you looked in the FAQ yet?
    How about the Wiki?



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  4. #4
    FLAC Jahntassa's Avatar
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    Drew is probably closer to the issue at hand. The IGN wire can go to any source of switched power, even an external switch. All it does is act as a trigger to turn on the device, and a reverse trigger to tell it when to shut down.

    There's no problem wiring the IGN line to an external switch, but if the wiring is reversed, there would be.

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    Neither darque nor pervert DarquePervert's Avatar
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    The way I understand it, the PSUs sense 12v on the IGN line, which triggers startup. I don't see how a switch is going to provide the 12v for the PSU to sense....
    Also, a switch is going to require two wires out to complete the circuit, yet there is only one IGN wire with no corresponding ground....

    Potentially, could someone wire a switch fromt he IGN to the ground and have it function?

    I can see if there's a switch on a constant 12v line, so that when the button is pressed it will trigger a startup or shutdown (depending on whether the switch is opened or closed)... But if there's no power behind it, I don't see how the PSU's startup would be triggerd....
    Have you looked in the FAQ yet?
    How about the Wiki?



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  6. #6
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    yeah was just assuming he'd put a switch in line with a constant 12v source, like from the radio wire harness

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    the switch is run to a constant 12v. all the switch does it complete the circuit between the 12v source and the ign wire. also the wires are labled 12v, grnd, and ign. only thing is that the white wire is the 12v and the red is the ign...which in my past experience red has always been the 12v and white has always been the signal, rem, ect. i guess i could try switching them to find out. so..if they were hooked up correctly would the computer properly shut down when the switch is turned off or would it just die? another question. if i were to wire it to the ignition of the car where would be a good spot? can i just run it to the ignition fuse?

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    try switching them, cant do any harm. If you want to run from ignition you can use the ignition wire that supplies the radio with an ignition switching 12v supply. Assuming that it is set up to shutdown/hibernate/standby on pressing the power switch, cutting the ignition supply will have the same action as pressing the power button, probably pre set to shutdown gracefully.

    I take it that the power to the pc is cut instantly when the switch is thrown?

  9. #9
    Neither darque nor pervert DarquePervert's Avatar
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    Quote Originally Posted by wrxeatr
    the switch is run to a constant 12v. all the switch does it complete the circuit between the 12v source and the ign wire. also the wires are labled 12v, grnd, and ign. only thing is that the white wire is the 12v and the red is the ign...which in my past experience red has always been the 12v and white has always been the signal, rem, ect. i guess i could try switching them to find out. so..if they were hooked up correctly would the computer properly shut down when the switch is turned off or would it just die? another question. if i were to wire it to the ignition of the car where would be a good spot? can i just run it to the ignition fuse?
    Yes, you can run it to the IGN fuse. My DSATX is wired to the ACC line on the back of the stock HU wiring harness and it works peachy.

    And if you wire it with both the 12v and the IGN (with a 2-position toggle switch in-line) to an always-hot 12v, it will work a little bit differently than the power button on a PC.
    The switch will need to be in teh closed (on) position for the PSU to startup/shutdown, for one. If you turn the switch off while the PC is on, the PSU should initiate shutdown, because it sees the lack of 12v on that line, same as if you turned the key off.
    If the switch is in the open (off) position when you turn the key, the PC will not start. However, when you close the switch, the PSU should startup the PC.
    Have you looked in the FAQ yet?
    How about the Wiki?



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