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Thread: Powercord to Firewall Question

  1. #1
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    Powercord to Firewall Question

    Hi everybody, I've been powering through these forums and a bunch of others trying to get as much info as possible on Carputers. Pretty sure I'm gonna get started but I want to plan it out a little better.

    Currently I'm driving a Mazda Speed6 with a 12in sub and amp hooked up in the trunk. The existing power line from my amp is drilled through the firewall but I'm not sure how. As far as I can tell the factory drilled through an existing bracket. I don't think its a grommet b/c its metal.
    Forgot to mention that I did not do the sub and amp hook-ups.

    Anyways I'm looking for some feedback as to see what people would recommend is the best way of running another power line from my power supply to the battery. I was thinking drill another hole below the amp power cord and run it through or am I better off just drilling a completely new hole and putting a grommet there. Thanx in advance.



  2. #2
    Vendor - Qube colin's Avatar
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    Most people try to use factory grommets like that because you know the location is safe and you know where the wire comes out. I'd just pop a hole on the other side.

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    I have very little room in my engine bay but I may be able to drill it with an extension and long drill bit. If I pop another hole and have a good gauge wire should I be worried about shearing? That red amp power line is just run through that hole so my car PC line should be ok I'm guessing.

    Also once I drill the hole it should be visible once I remove my stereo system from my dash or is there some other layer I must get through? thanx for the fast response by the way.

  4. #4
    Mod - all of it. SapporoGuy's Avatar
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    Almost every time I put my amp power line in I either did the above like in the picture or just found another convenient factory hole. I drive domestic Japanese cars so I can understand the engine bay being hard to deal with.

    Drilling a hole to go straight to your radio would extremely difficult.

    Import/Export cars used to be dual usage ... you might be able to find a way in on the passenger side.

    Also, why are you so interested in making a new hole? Water?
    If so, then more than likely the red power line above is a water entry heaven.
    I usually loop my lines down and then up into the hole.

  5. #5
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    Yea it might be better to just run it through that grommet, should be enough run. As for drilling a hole directly to my stereo no I am not trying to do that. I'm just wondering once I pull my stereo out will I be able to reach in and grab my wire since its basically right behind the steering wheel.

    I'm thinking I may have to remove some plastic under the steering wheel, I really won't know until the stereo comes out. As for running the power cord through the grommet I shouldn't get any interference from all those wires rubbing together right? Thanx again.

  6. #6
    MySQL Error soundman98's Avatar
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    the factory grommet method like above is one of the more popular ways to run wire-- i have done it to all the my families cars, except my current car, where i ran it through the drivers side fender, where the factory harness was(space constraints-- and there really wasn't a large enough grommet for a power wire). i only had a problem once-- when i tried driving my old car through 2-3 feet of water(long story...), then a little came in, but other wise, no other problems.

    i like to use a brand new razor blade to make a 'X' in the rubber, a little smaller then the wire i will be pulling, so that when i push the wire through, the rubber will flex around the wire sealing it for most conditions.

    i also like to use a length of stiff, solid core, 14-12 ga. electrical wire to pull my wire through the car-- because it is solid core, it allows me to flex the wire where ever i need the real cable to go.

  7. #7
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    Yea I'm gonna use some thick wire, not so thick it won't fit through that grommet but thick enough. I just have one more question about power supply connections, I don't know if I should open a new thread for this but I'll just ask it here if someone can answer it for me.

    My ground lead will go to a seat belt bolt on the passenger side, I'll sand it down if its painted. Everything will be under the passenger seat to keep wires as short as possible. When you guys connected your ignition switch wire to your cars (from the PSU to your car) did you just cut the cars ignition switch wire and resolder the PSU wire into it?

  8. #8
    MySQL Error soundman98's Avatar
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    i used a aftermarket wire harness to get the acc wire from the factory harness-- a sacrificial harness if you will.. this way, i have no fear of hacking up the harness(well, an new harness is $15 or so, so not as much of a fear ), because i can just get another one if i mess it up, and don't have to rewire the car..

    the other bonus to the aftermarket harness, is that most of them will have writing on all of the wires to let you know what they are for-- this really helps when connecting everything-- you can verify it without needing a color code chart..

  9. #9
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    Actually, instead of finding my ignition wire/ ACC wire, could I just get my cig lighter wire and hook it up through that? All I really need is a hot wire to trigger my PSU on/off and the cig lighter is closure and probably much easier to find. Has anyone done that before?

  10. #10
    MySQL Error soundman98's Avatar
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    i can't remember seeing any installs that use the cig lighter wire, but as long as it is fused, i don't see any problem doing that.

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