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Thread: best use for ignition wire?

  1. #1
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    best use for ignition wire?

    Hello everyone. I need some advice. I am trying to figure out exactly how I should power my PSU. I may just invest in a distribution block in case I want to add on an amp later... my question is more about powering the screen off the PC or ignition wire.

    I have an Eonon E1062 that has the stock harness connected. I assume that one of those wires is the ignition wire... so, is it possible to splice this wire and use it as a dual output? Or would I have to run the ignition wire to the PC and power the screen off the PC? Which method is more common?

    I searched for ignition wire adapter type things, but couldn't come up with anything, so maybe I'm a little too optimistic on how easy it could be. But anyway, does anyone have any particular advice/pros/cons to these ideas?

  2. #2
    Fusion Brain Creator 2k1Toaster's Avatar
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    If replacing the HU with a screen then you can use the ignition line to directly power the screen just fine. Just make sure to use the included voltage regulator.

    The screen shouldnt draw much more than an amp, and that is fine for the stock wiring.

    It is always best though to use the ignition line as a trigger only. So you would connect the trigger line to a relay, and then the relay passes through a higher current (lower gauge) wire to actually power the device.

    I would take the +12v from the PC as the trigger for the relay. Reason being when you have a SDC on your PSU, you want the screen on when the computer is on, not only when the car is on. So you turn off the car, and with me, I have 30seconds before the PC shuts down. With the relay tripped off of the ign, the screen would go instantly. But when tied to the PC, it goes when the PC goes.

    I actually have it powered off of a constant source since I turn my car on and off so many times in a short span doing food deliveries.
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  3. #3
    Variable Bitrate Grrrmachine's Avatar
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    I have a power distribution block, which runs to the PC (laptop docking station), the screen and the amp. Between the car battery and the distribution block is a fuse (of course), and a relay, which is triggered by the ignition line. This does mean, of course, than when you turn off the ignition ALL power stops to the PC immediately (unless, like my laptop, you have a battery to do the shutdown procedure.)

  4. #4
    Fusion Brain Creator 2k1Toaster's Avatar
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    Quote Originally Posted by Grrrmachine View Post
    I have a power distribution block, which runs to the PC (laptop docking station), the screen and the amp. Between the car battery and the distribution block is a fuse (of course), and a relay, which is triggered by the ignition line. This does mean, of course, than when you turn off the ignition ALL power stops to the PC immediately (unless, like my laptop, you have a battery to do the shutdown procedure.)
    well the way you wired it, yes...

    But most people wire it the correct way which is to use a smart power supply that takes a constant line and an ignition line and will turn on/off a configurable time after the ignition changes state.
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  5. #5
    FLAC
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    i wouldn't use the ignition wire for anything but turn on signals, just to be on the safe side.

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