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  1. #1
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    Oct 2006
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    Firewall passthrough?

    Just curious how you ran your harness, and what did you use if you ran it into the passenger compartment.

    Pics of your wire hiding/routing would be awesome!
    Confucius says, "Choose a job you love, and you will never have to work a day in your life"

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  2. #2
    Join Date
    Nov 2010
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    238
    What kind of car and which harness are you running?

  3. #3
    Join Date
    Aug 2007
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    333
    I've used the daystar grommet for the firewall pass thru. More cost effective is making a trip to the local salvage yard and collect a bunch of various grommets from wrecked cars. Firewall grommets and door grommets of all shapes and sizes. I bought a bunch for $10.

  4. #4
    Join Date
    Oct 2014
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    DFW, Texas
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    There is a split grommet that gets riveted into place that summit sells for about $30. I’ll have to dig up the name, but it worked pretty well. It allows for a big enough hole to route connectors and closes back up to a reasonable harness diameter.
    1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
    1976 Dodge D100 - Warlock
    2016 Subaru WRX - E30 Tune

  5. #5
    Join Date
    Apr 2006
    Location
    Atlanta, GA
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    107
    I used one from a junkyard (OK- my parts car in the garage!)-

    Here's a couple of ways-


    https://www.diyautotune.com/product/...et-1-00-split/

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    Here's another-

    https://www.diyautotune.com/product/...connector-kit/

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  6. #6
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    Quote Originally Posted by firebirdzig View Post
    What kind of car and which harness are you running?
    I have a 67 camaro. The main body harness is going through the factory location by the steering column, but im at a loss for what to do about the engine harness for the fitech system. Im up for any ideas.
    Confucius says, "Choose a job you love, and you will never have to work a day in your life"

    My build Beast

  7. #7
    Join Date
    Oct 2014
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    Quote Originally Posted by Richard454 View Post
    I used one from a junkyard (OK- my parts car in the garage!)-

    Here's a couple of ways-

    I have the seals-it, works pretty well. It's about the only game in town to pass through giant connectors.
    1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
    1976 Dodge D100 - Warlock
    2016 Subaru WRX - E30 Tune

  8. #8
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    Oct 2006
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    Anybody run the ecm in the engine compartment? How did you hide the wiring? Im just trying to get ideas/options. A passthrough would clean it up quite a bit, but im curious about running it in the engine bay as well.

    Thanks to the idwas so far. Ive considered the seals it, but havent seen the connectors.
    Confucius says, "Choose a job you love, and you will never have to work a day in your life"

    My build Beast

  9. #9
    Join Date
    May 2013
    Location
    Colton Ca.
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    I'm going to use the ones in the link below. They're about the 8th item down the page. They're the most affordable bulkhead and make engine removal easier. You use regular wire terminal crimpers so that makes them more affordable.

    https://paradiseracing.com/page/2/?p...duct&s=Harness
    Ahmad B.

  10. #10
    Join Date
    Aug 2016
    Location
    Tampa FL
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    96
    What harness for FITECH ? I was planning that as a future upgrade, But I am all out of under dash space !
    But Also to your point--> I added spade connectors to empty slots of the bulkhead connector to add some of my engine area wiring.

  11. #11
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    Quote Originally Posted by Build-It-Break-It View Post
    I'm going to use the ones in the link below. They're about the 8th item down the page. They're the most affordable bulkhead and make engine removal easier. You use regular wire terminal crimpers so that makes them more affordable.

    https://paradiseracing.com/page/2/?p...duct&s=Harness
    That looks really good also. Thanks for the idea
    Confucius says, "Choose a job you love, and you will never have to work a day in your life"

    My build Beast

  12. #12
    Join Date
    May 2019
    Location
    Pensacola,Fl.
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    27

  13. #13
    Join Date
    Feb 2019
    Location
    Kankakee IL
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    185
    An inexpensive item that makes a nice firewall grommet is a gladhand gasket used for semi truck. They're cheap and can pass a 2/0 cable through the hole.
    Tracey

  14. #14
    Join Date
    Mar 2008
    Posts
    36
    Here is another low cost option I just came across.

    https://ceautoelectricsupply.com/pro...wall-grommets/

  15. #15
    Are these solutions reliable enough?



  16. #16
    Join Date
    Jan 2006
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    Southern California / Maryland
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    I use Mil spec MS3470 connectors - Large bulkhead connectors I use the 32 pin style - Smaller ones I use for things like wiper motors and what not.

    downside is the cost

    1968 Dodge Charger SRT8 6.1L Hemi 6-speed

    1973 Dodge Challenger Rallye 340 Auto

    1964 Dodge Polara 8-71 Blown 440 4-speed

    2013 Dodge Challenger R/T 5.7L Hemi 6-speed

  17. #17
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    Dec 2005
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    And the cost of the tools to crimp
    Steve
    '68 Camaro - SBC, TKO600, 3.73 Moser 12-bolt, Speedtech, ATS-AFX, Hotchkis, Forgeline, Ron Davis and C5 brakes (Kore3), Holley Terminator TBI.
    Check it Out Here

  18. #18
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    Feb 2019
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    Kankakee IL
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    A tool that will always come in handy though.
    Tracey

  19. #19
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    Quote Originally Posted by eville View Post
    And the cost of the tools to crimp
    Yeah - that for sure is a kick in the junk. I actually got mine at a yard sale for $10 since no one knew what it was used for.
    1968 Dodge Charger SRT8 6.1L Hemi 6-speed

    1973 Dodge Challenger Rallye 340 Auto

    1964 Dodge Polara 8-71 Blown 440 4-speed

    2013 Dodge Challenger R/T 5.7L Hemi 6-speed

  20. #20
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    Dec 2005
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    That’s pretty good. I paid about $200 on eBay and thought that was “decent”
    Steve
    '68 Camaro - SBC, TKO600, 3.73 Moser 12-bolt, Speedtech, ATS-AFX, Hotchkis, Forgeline, Ron Davis and C5 brakes (Kore3), Holley Terminator TBI.
    Check it Out Here