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Thread: Car Computer Install: Wiring The Car

  1. #1
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    Jensen2000's Avatar
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    Car Computer Install: Wiring The Car

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    Sean Clark, from mp3Car, shows us how the various components in the vehicle are wired. Getting power cables through the firewall is one of the more difficult aspects of any install. In this case, drilling through the firewall of the Altima in the wheel well proves to be the best option. Be sure to use plenty of fire-retardant adhesive on these holes once the wires are fed through. Running the power cables to the trunk can be done along the sill of the driver door. Use care when prying the panel loose. A trim removal tool is recommended to prevent scratching of your OEM parts. The backup camera switching wire and accessory turn on wire are also run along the driver door sill. Wires that aren't associated with powering any device are run along the passenger side sill to prevent interference. These include the front speaker wires, an HDMI video cable, a USB touch cable, a USB iPhone cable, a USB OBD-II cable, a USB cable for an aux input, and a microphone 3.5mm audio cable.

  2. #2
    Maximum Bitrate boelle's Avatar
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    not an expert here... but this is the first time i have to comment on the series of video's

    why drill holes for those 2 power wires when there is a big fat rubber grommet just above? if if drilling holes not using a good rubber grommet will sooner or later cause trouble. adhesive is just not up for the job
    Blessed are the "cracked" for it is they who let in the light.

  3. #3
    Who am I? HiJackZX1's Avatar
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    I went a different route. I ran the 0 gauge wire through the engine bay, under the car to the bottom of the passenger seat. I then drilled two holes in the floor. Installed a grommet in each hole that seal as when you run the cable through and tighten them. Then ran the rest under the carpet from the back of the driver seat to the rear of the car. For the ground I drilled another hole, used a sealing grommet and attached to the chassis. You dont even notice the wire at all. In fact, Ive been lucky. It hides all 50+ wires easily, lol.

    PS: OMG Sean, cut your hair!!!!!!!
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    MySQL Error soundman98's Avatar
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    Quote Originally Posted by boelle View Post
    if drilling holes not using a good rubber grommet will sooner or later cause trouble. adhesive is just not up for the job
    i was just working on some a/c power wires the other day that blew a softball-sized hole in a enclosure because the connection wasn't terminated correctly.. of course, that breaker was rated for something like 1500 amps @ 480v, so it had a little more power, but still-- once that cable vibrates enough to cut it's insulation, it should be a nice loud POP.. take a video!

    fire rated caulk really isn't needed... just high temp stuff-- standard silicone fits the bill as it is both high temp, and waterproof.

    so far, i have installed cabling in 5 vehicle-94 lebaron, 96 ranger-- used a existing grommet(cut a 'x' in a open part of the grommet-- seals the wire and makes it easy to pull through), 94 baretta, and 96 grand am--required a hole to be drilled because the main harness access was blocked, and a 01 eclipse-- was able to follow main harness through 1/4 panel, through a water shield(it was flat, so it wasn't a grommet)

    also-- it doesn't appear that your car has it, but most of the cars i have worked on have the sill panels attached by either screws, or threaded rods-- sometimes only right below the dash, and others have it attached at both far ends, so it isn't as easy as the video shows-- though most cars do have those nice little wire trays along the edges..


    and for those with older cars-- always be very careful removing any parts, as older parts tend to break easier.

  5. #5
    Maximum Bitrate david69leonard's Avatar
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    I hope you have some fuses on your power cables big guy!!! Sure didnt see any, lol I installed a system in my co-workers altima and I ran the power wire through the rubber grommet that the factory wire harness uses.... Other than that looks like it is coming along!

  6. #6
    Raw Wave
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    Definitely not good without grommets else some flexitube.

    Otherwise ensure good fusing - but when problems occur - IMO it isn't worth the likely intermittents.

    Readers should not be placing wiring unprotected thru body & chassis holes. (You car would be defected here!)

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    Maximum Bitrate boelle's Avatar
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    Quote Originally Posted by david69leonard View Post
    I hope you have some fuses on your power cables big guy!!! Sure didnt see any,
    upps missed that one but yeah.. no fuse... standard is to have is as close to battery as possible before wire are able to touch anything
    Blessed are the "cracked" for it is they who let in the light.

  8. #8
    Raw Wave
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    Or in this case, at least anywhere between the power source and that bluddy panel...

    ok, I haven't seen it for a while - surely this is a prudent time for 2k1Toaster's Zap-OLighter aka the Car Toaster...

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    I have to agree with the wire going through the fender well. The install looks great so far, and a nice job, but that just worries me.

    That sheet metal is probably like 1mm thick, and sharp from running the drill through it. Vibration will most likely start to cut through the insulation over time. As soon as one little piece of the bare wire touches the sheet metal, it is gonna POP and weld itself to the frame, creating a very very bad, heavy gauge wire, direct short. A very good possibility that your battery will explode. Even if the battery does not physically explode, you can fry just about everything in the car, and even a very good chance of a fire as the wire insulation melts and combusts, then jumps over to the plastic wheel well cover, the tire... you get the idea.

    The factory wiring harness goes through the firewall just a couple inches above where you drilled, can't you run the wires through there? At the least, drill your hole a little larger and make room for a rubber grommet in the hole to run the wires through.


    Is there something on the inside that prevents you from just putting the wires through the firewall here with the rest of the car's factory wiring harness?

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    On another note:

    From the video:

    every car is different and there might be more than one panel for you but the important thing with most of..... is that you take the biggest flat head screwdriver you can find....
    I just found this one on eBay

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    Last edited by JohnWPB; 12-02-2011 at 01:10 PM.
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  10. #10
    Who am I? HiJackZX1's Avatar
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    I agree.... He needs to put a grommet on there. I recommend the one I use, and you guys probably sell. Also its not a big deal where he ran the cable, because remember the big plastic/rubber flap in the wheel well is going to cover it.
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