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Thread: Power cable through firewall (How to)

  1. #1
    Member Maestro's Avatar
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    Feb 2018
    Quebec City
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    Power cable through firewall (How to)

    I talked to some of the mechanics working at my dealer and they told me most people go through the firewall by using a clothes hanger to punch trough the rubber gasket that lets the wiring go to the engine compartment. Here's how I did it...

    I straighten a clothes hanger and from the engine compartment I used it to punch a hole in the rubber gasket:

    Be careful when you punch the gasket, there are 2 layers of rubber, go straight trough the first one and then when it gets to the second layer of rubber get it away from the cable harness so you don't risk scraping the car wires!!!

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    Here's a photo of what it looks like from inside the car, driver side under the dash:
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    Then I used some duck tape to attach the power wire to the clothes hagner (about 3 to 4 inches of cable so its sturdy enough to go through the rubber gasket):
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    Then I pulled on the clothes hanger from the inside, carefully because you don't wanna pull the gasket away from the hole in the firewall:
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    I used a Schosche AMP kit rated for 160 watts from Walmart and its got a 12 gauge power wire.. as you can see it fairly big with the tape holding it to the clothes hanger so you gotta be _very_ careful when you pull it trough the rubber gasket! :
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    Netx, I'll be posting some photos and a how to to get all the wires to the back of the car and connecting the head unit to the sub.

    Last edited by Maestro; 06-17-2018 at 02:17 PM.

  2. #2
    Member Maestro's Avatar
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    Here's the Scosche amp wiring kit I used:

    Scosche model KPA12FA

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    I also bought a Scosche 125 watts sub from Walmart.. yeah yeah, its not a very high power super hifi sub but its enough for me considering the whole kit cost under $200... (can't find it on the Walmart web site anymore)... You can find it on the interweb easily...

  3. #3
    Senior Member MrMicra2015's Avatar
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    Vancouver BC
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    there is another way that does not go throught the main wire harness, there is an unused "bung" on top of the the driver side fender visible from the wheel well that goes into the interior, there is a short thread about it somewhere on the forum...and a pictue was found by 514Xave..good writeup though, and another option!!
    Last edited by MrMicra2015; 06-18-2018 at 03:24 PM.
    2015 Micra S (manual)
    no A/C /no power options/ block heater/4x 2 Ohm speakers...all factory stock in 2015
    Feb 2015 build
    9,999 purchase price + additional 1600$ because it was a 2015 purchased in 2016
    so receipt says $8,399....+1600 .... so they look good i guess...for a brand new car!

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  5. #4
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    Garage empty: add car
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    Does this thread still exist on where the unused bung is i would like to read more into it thank you

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