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Thread: M2-ATX included power connector's wire too thin?

  1. #1
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    Question M2-ATX included power connector's wire too thin?

    Hey guys

    Quick question that I haven't been able to find via search... I bought this stage 2 system from here: http://store.mp3car.com/Mp3Car_Custo..._p/ccc-122.htm

    The included P4 cable to supply power to the M2-ATX power supply has 18AWG 12v positive, accessory and ground wires. However, I will be supplying the power to the M2-ATX via a 10AWG wire directly from the battery. My question is, should I get a new P4 plug that I can fit a 10 AWG wire into for the 12v positive wire? I think 18AWG is too thin given the max amp draw of around 12amps? Or have you guys just connected the thicker gauge wire from the battery to the 18AWG P4 wiring? I would rather not create a hot spot!

    Many thanks

  2. #2
    Low Bitrate
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    The P4 cable doesn't supply power to the M2 ... it supplies power to the motherboard from the M2.

  3. #3
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    Quote Originally Posted by NibbleIT View Post
    The P4 cable doesn't supply power to the M2 ... it supplies power to the motherboard from the M2.
    Sorry probably have my terminology wrong...The cable I'm talking about plugs into the back of the car pc case and is meant to be wired up to 12v battery, accessory feed and then a ground. I thought the plug was still a P4 style. In either case it powers the power supply, so the same question applies I guess thanks

  4. #4
    FLAC
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    I know the cable you're talking about, got the same one on my Ampie and it's not P4.
    The gauge of wire is directly related to the length of the wire. You could run a 20 foot 4 gauge wire and a 1 inch 18 gauge wire and they'd probably (just a guess for illustration purposes) run at the same resistance. So as long as the thinner wires aren't very long, you can likely just solder the 10 gauge right to them and be fine for that short distance.
    Ampie Case
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    256 MB DDR2 PC5400
    Xenarc 700TSV - VGA Monitor
    Intel D945GCLF Motherboard
    M2-ATX-HV

    2005 Honda Civic

  5. #5
    Variable Bitrate Zogg's Avatar
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    If you google on wire ratings you'll find the rating for 18AWG wire, and the maximum current draw for the M2 fits within the rating for this wire. I don't remember the numbers but I checked them when I first got my M2.

    I ran 12 gauge wire to a terminal block, and connected the 18AWG wire to the block as well. Works fine.
    Zotac N630I-D-E M/B w/ Nvidia 7100, E5300 cpu, Xenarc 700IDT, M2-ATX, XP, RR & DFX 5.1.

  6. #6
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    Maheriano & Zogg,

    Thanks for your responses! When I was looking up the current ratings for the wire, I didn't think to take into account that the length of the 18AWG wire would be very short and hence might be OK. I saw that the "Maximum amps for power transmission" was only 2.3A on this table http://www.powerstream.com/Wire_Size.htm and I thought the M2-ATX draws up to about 15A?

    Thanks again!

  7. #7
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    Actually, I should be looking at the "Maximum amps for chassis wiring" right? http://www.powerstream.com/Wire_Size.htm
    That's what was confusing me when I was looking at "Maximum amps for power transmission"

    Thanks Maheriano & Zogg for clearing things up guys.

  8. #8
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    Thanks for that answer as well. I had the same concern with a mo-co-so case.

  9. #9
    FLAC
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    Quote Originally Posted by cheap1 View Post
    Actually, I should be looking at the "Maximum amps for chassis wiring" right? http://www.powerstream.com/Wire_Size.htm
    That's what was confusing me when I was looking at "Maximum amps for power transmission"

    Thanks Maheriano & Zogg for clearing things up guys.
    No problem. Electricity is a funny thing.
    Ampie Case
    2.5" Hard Drive 80GB Samsung 5400RPM
    256 MB DDR2 PC5400
    Xenarc 700TSV - VGA Monitor
    Intel D945GCLF Motherboard
    M2-ATX-HV

    2005 Honda Civic

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