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Thread: Optional Power Switch (M2-ATX)

  1. #1
    Low Bitrate scottholmes's Avatar
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    Optional Power Switch (M2-ATX)

    Hi All

    In the middle of sorting my car PC out and i have been trying to get some information about a power switch that i can have that will allow me to leave the PC off if im only doing a short journey.

    So if its set to ON PC will power up when turning over the car, if its OFF it wont

    Ive read a few posts on the forums, and i think im right in that i would install a switch inline on the ACC line, is this correct?

    Also, if so what kinda switch do i need? Anything in particular or just an ordinary onn/off switch?

    Scott

  2. #2
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    I used this switch for that exact purpose...

    http://www.parts-express.com/pe/show...number=060-405

    Any switch in line with the ACC line to the PSU will work though.

  3. #3
    Low Bitrate scottholmes's Avatar
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    That's the style I actually googled, spooky! With the 4 pins at the bottom is it easy to wire?

    I have no auto electrical expertese at all! Seeing there are 4 pins and only 2 wires (from cutting the wire) I'm confused already

    Scott

  4. #4
    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by scottholmes View Post
    That's the style I actually googled, spooky! With the 4 pins at the bottom is it easy to wire?

    I have no auto electrical expertese at all! Seeing there are 4 pins and only 2 wires (from cutting the wire) I'm confused already

    Scott
    Bottom 2 are for the LED. This particular one you'd run a small 680ohm or moderately higher resistor off the lead that becomes hot when closed to the + LED contact on the button, in addition to the outgoing ACC line to the PSU, so the LED lights up when on rather than constantly. Use a higher ohm one if you don't want it as bright.
    2008 Ford Mustang GT/CS CARPC(99%)
    Software: Ride/Road-Runner, Digital FX skin 5.x, iGuidance 2011, GPSgate on Win7 64bit

  5. #5
    Low Bitrate scottholmes's Avatar
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    Ah ok, that makes sense. If for whatever reason didnt want or need a visual led i could just ignore the bottom two?

    Thx!

    Scott

  6. #6
    Variable Bitrate Wayne613's Avatar
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    Quote Originally Posted by scottholmes View Post
    Ah ok, that makes sense. If for whatever reason didnt want or need a visual led i could just ignore the bottom two?

    Thx!

    Scott
    Yep, not necessary if you don't need/want the LED. While you can just use crimp-on blades to connect to the switch, you'd have to solder the small resistor between the contact points for the LED.
    2008 Ford Mustang GT/CS CARPC(99%)
    Software: Ride/Road-Runner, Digital FX skin 5.x, iGuidance 2011, GPSgate on Win7 64bit

  7. #7
    Low Bitrate scottholmes's Avatar
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    Quote Originally Posted by Wayne613 View Post
    Yep, not necessary if you don't need/want the LED. While you can just use crimp-on blades to use the switch, you'd have to solder the small resistor between the contact points for the LED.
    I think i need to hire you to be my personal advisor

    I have no need for the led, think it would annoy me more than anything. I have loads of those crimp things so that will do.

    Thanks to you both.

    Scott

  8. #8
    Low Bitrate scottholmes's Avatar
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    Found one on eBay that has only 3 PINs, GND (obvious where that goes) and then PWR and ACC.

    Wiring that in would it be PWR to the ACC line (as thats where it will get the power) and then the ACC pin connects to the M2?

    Or have i totally got no clue what im talking about and its the other way round?

    Scott

  9. #9
    Variable Bitrate Wayne613's Avatar
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    Why ebay though with all the online parts stores? That should be correct, yes. Assuming SPST, worst that will happen is the LED will be on constantly rather than only when your PSU is getting the ACC feed should the acc/pwr lines be reversed. Do you have a link?
    2008 Ford Mustang GT/CS CARPC(99%)
    Software: Ride/Road-Runner, Digital FX skin 5.x, iGuidance 2011, GPSgate on Win7 64bit

  10. #10
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    the three pins are the same concept of the switch above it just uses the same ground there for no need for the forth pin one is positive one is ground and one is acc which is for the led if you dont want the led just hook up the to powers and not the ground.

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