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Thread: M1-ATX Wiring Question

  1. #1
    Newbie Imobejoas's Avatar
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    M1-ATX Wiring Question

    I just got my M1-ATX today, It has a white wire I'm assumming is connected to the switched (ignition) 12V lead.

    I was wondering....

    1. If the white wire was just a relay wire, and if so, does the guage of wire have to be that thick or could it just be any wire (not too thin of course) wired up to the switched 12.

    2. Does the M1-ATX run off of the ignition switched 12v or the always on 12V? I'm guesing the always on 12v, but I just wanted to double check.

    3. Where should I hook up the 12V ignition switch wire? I was thinking up to my head unit, but the head unit wire is already pulling it's own load and the vga screen.... one more gonna be okay? If not, then where else?

    Thanks in advance!

  2. #2
    Raw Wave rando's Avatar
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    The 12V always on connection should be powered from a new circuit run directly from your battery. This is the main power wire and should be size appropriate to handle the maximum input current of the supply as well as to avoid voltage drops which will lower your hard cutoff margin -- 8 to 12G is appropriate depending on the length of your runs. The IGN line can be sourced from whatever is appropriate for your setup. The supply only uses this line to for logic level switching. 18G should be fine.

    * I don't anything about the wire colors you're talking about. My M1-ATX did not come with any power wires -- just 3 spade terminals.

  3. #3
    Variable Bitrate
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    I just installed my m1-atx. Before hand I tested it with about 6 feet of 22awg wire and powers up just fine and dose every thing it should with no problem (survives crank). Wire didn't even change temps. Just leting you know that you can use a smaller wire if you have some laying around and don't have any extra cash. PC is a via M10k with slim 8x dvd rom, full size hard drive, dlink 802.11 b/g pci card, usb blue tooth, usb keyboard, usb mouse. The m1-atx was also powering a noritake 7000 VFD.

  4. #4
    Raw Wave rando's Avatar
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    22AWG is way too small for extended use at full power. Also, at high power levels, you will see a substantial voltage drop over 22AWG. This will cause the low voltage shutdown feature to kick in earlier.

  5. #5
    Low Bitrate bd3521's Avatar
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    So what AWG should be used?
    -------------------------
    carputer: in progress
    Laptop install

  6. #6
    Newbie Imobejoas's Avatar
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    The way I see it, since I'm using a Morex 3688 box. From the socket to the power supply pcb, they are using 18AWG wire. The THINNEST wire then, should be 18gauge wire. I think 14 stranded should be more than adequate. The wires in the house, supplying 120VAC are using 14 IIRC. Heck, from the power brick of my case to the socket isn't even 18GA. So 18 should be OK

  7. #7
    Raw Wave rando's Avatar
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    Quote Originally Posted by bd3521
    So what AWG should be used?
    See post #2.

  8. #8
    Raw Wave rando's Avatar
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    Quote Originally Posted by Imobejoas
    The way I see it, since I'm using a Morex 3688 box. From the socket to the power supply pcb, they are using 18AWG wire. The THINNEST wire then, should be 18gauge wire. I think 14 stranded should be more than adequate. The wires in the house, supplying 120VAC are using 14 IIRC. Heck, from the power brick of my case to the socket isn't even 18GA. So 18 should be OK
    This has been discussed here and elsewhere countless times before. If you use 18AWG for your power mains, you will almost certainly run into problems. Here's a reference site I pulled up on Google. There are many others.

    http://www.powerstream.com/Wire_Size.htm

  9. #9
    Variable Bitrate drait's Avatar
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    @rando: I wired my M1 with 16 gauge from the power distribution block near my amps (which has 8 gauge wiring to the battery). Do you think this thin of wire is what is causing my M10K to occasionally beep upon resume from hibernation? Here's a quick scenario: I go to a gas station, turn off the car. M1 is set to hibernate after 5 seconds, and power off 5V after 45 seconds. After filling car (say 3-4 minutes) I start it back up. Instead of the M1 turning on the M10K, it makes the motherboard emit repetitious beeping from the peizo every 1.5 seconds. The only way for me to "fix" this is to pull the +12V (or ground) lead from the M1 and then reconnect it. I've often wondered if this was a power-related issue, or if my M10K is bad. Mind you, it doesn't always do this, just when it seems like I've stopped for a very short time. If I leave the vehicle for any extended period, it starts up just fine.

  10. #10
    Newbie Imobejoas's Avatar
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    Short 1 to 2 ft distances 18 is okay, voltage drop is minimal. If you are bent on using 18 guage, one solution is to have a few 18 guages in parallel, which will divide your RDC by the number of 18 ga you use.

    I think that's the route I'm going to take. I have plenty of 18ga. And my existing 18guage has a socket connector which convientiely plugs in.

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