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How do I run a 4 gauge power cable through the firewall?

Discussion in 'Audio & Video' started by Madjik_Man, Nov 9, 2012.

  1. Nov 9, 2012 at 3:40 PM
    #1
    Madjik_Man

    Madjik_Man [OP] The Rembrandt of Rattle Can

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    I see the two rubber grommets, one on the driver's side and one on the passenger side, which wiring harnesses run through.

    Obviously I am targeting those as the channels to run this power cable through.

    However I am stumped as to how I accomplish this.

    For starters I can barely fit my hand(s) up behind the dash in either spot and can barely fit my hand between the brake booster (?) and the spot on the firewall in the engine bay.

    Any tricks of the trade anyone can share with me?
     
  2. Nov 9, 2012 at 3:43 PM
    #2
    jberry813

    jberry813 The Mad Scientist

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    Drill a hole where you can fit your hands and the wire and put a rubber or plastic grommet to keep the sheetmetal from cutting into the wire.
     
  3. Nov 9, 2012 at 3:45 PM
    #3
    LUSETACO

    LUSETACO Central Scrutinizer

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    I used a slightly sharpened coat hanger with the wire taped to it. Pushed it through the engine bay side of the firewall.
     
  4. Nov 9, 2012 at 3:45 PM
    #4
    Aw9d

    Aw9d That one guy

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    exactly
     
  5. Nov 9, 2012 at 3:58 PM
    #5
    ItalynStylion

    ItalynStylion Sounds Gooooood

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    I ran 2 gauge through the firewall using the existing grommet on the drivers side. No need to drill anything.

    Grab a large pair of scissors and poke them through the rubber grommet in an area where the wires aren't. In fact, I believe there's a small slit in it already in an area. Poke them through the grommet to make your own hole. When you get through the other side open the scissors slightly to widen the hole. Then pull them out. After that you just push the wire on through. Easy and requires no extra parts! :D
     
  6. Nov 9, 2012 at 4:45 PM
    #6
    pinktaco808

    pinktaco808 Hot Steppa

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  7. Nov 9, 2012 at 5:09 PM
    #7
    kai38`

    kai38` Well-Known Member

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    x2 on the coat hanger, poke it thru the rubber grommet,tape the wire to it and push thru reach up under dash and feel around for the coat hanger and slowly pull it through. It might take a couple of tries if the wire pulls off the coat hanger.
    Another way I've done it is I have a broken aluminum arrow shaft that I cut down to 6 in with a angle point on it. Push it through the rubber then feed your wire through the center of the arrow shaft.
     
  8. Nov 9, 2012 at 5:21 PM
    #8
    Madjik_Man

    Madjik_Man [OP] The Rembrandt of Rattle Can

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    4 gauge wire is much larger in diameter than a coat hanger or arrow shaft.
     
  9. Nov 9, 2012 at 5:22 PM
    #9
    Madjik_Man

    Madjik_Man [OP] The Rembrandt of Rattle Can

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    I'll try getting the #3 flathead screw driver through the grommet again.

    Then what I might do is affix a zip tie to the cable push the zip tie through, then reach up behind the dash and just try to pull the facker through the grommet.

    :notsure:
     
  10. Nov 9, 2012 at 5:23 PM
    #10
    Madjik_Man

    Madjik_Man [OP] The Rembrandt of Rattle Can

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    I'll try getting the #3 flathead screw driver through the grommet again.

    Then what I might do is affix a zip tie to the cable push the zip tie through, then reach up behind the dash and just try to pull the facker through the grommet.

    :notsure:
     
  11. Nov 9, 2012 at 5:30 PM
    #11
    hkdontoyotas

    hkdontoyotas Active Member

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    I have seen firewall rubber grommets that are tapered to what ever size harness or wire you are putting thru it. you cut at the size you need and it is self sealing in the engine side. also looks like a cv boot except the firewall side is flat with a lip to lock onto the sheet metal.
     
  12. Nov 9, 2012 at 6:13 PM
    #12
    brian

    brian Another Traitor

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    Poke through it with your largest screwdriver. Make a new hole inside the grommet, at least thats my preference. From there on its being a man and pushin hard. Sometimes you can take a smaller screwdriver, tape the shit out of the wire ONTO the screwdriver and pull it through, but 4 guage is rigid enough to just push through.
     
  13. Nov 9, 2012 at 6:24 PM
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    jberry813

    jberry813 The Mad Scientist

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    [​IMG]
     
  14. Nov 9, 2012 at 7:38 PM
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    brian

    brian Another Traitor

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    I was waitin for someone to pick up on that :D
     
  15. Nov 9, 2012 at 7:51 PM
    #15
    tango down

    tango down Policy Ninja

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    /\ truth bomb right there. The zip tie trick also works for snaking wires through the door hose elbow things.
     
  16. Nov 10, 2012 at 5:50 AM
    #16
    2012TXbaja

    2012TXbaja Active Member

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    Has anyone other than me tried to route the power/ground wires from the engine compartment down inside the frame rail then up into the rear of the cab where most people mount their amplifiers? I know there are grommets in the floor of my doublecab behing the rear seats. I am going to be using two of the floor grommets to route my subwoofer wires from my amplifier box I mounted in the bed of my truck.

    It's just an alternative way that I thought about running my wires. I even went as far as wrapping my power/ground wires with corrugated sleeving to help protect the wire and to also give it more of a factory look to my installation.
     
  17. Nov 10, 2012 at 6:09 AM
    #17
    brian

    brian Another Traitor

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    Nothing wrong with that IMO. I've done it before....not on taco tho. It definitely helps to have some extra insulation if you're gonna be rubbin against the frame tho.
     
  18. Nov 10, 2012 at 6:33 AM
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    Large

    Large Red

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    Cut a peice of the grommet with an exacto knife and silicone back, I have 2 (4 gauge) wires and 6 #12 gauge wires running through mine.
     
  19. Nov 10, 2012 at 6:34 AM
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    Large

    Large Red

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    Saw you were a first gen, not sure if the grommets are different in 2nd gens :notsure:
     
  20. Nov 10, 2012 at 6:38 AM
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    brian

    brian Another Traitor

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    and then a guy walked into a bar and said "Hi, my name is Large!, I wear three legged pants!"

    :rimshot:
     
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