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Thread: Need Advice, Power Wire through Firewall?

  1. #1
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    2018, Mazda, CX-5, Snowflake Pearl, Grand Touring

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    Need Advice, Power Wire through Firewall?

    I installed my DrawTite hitch yesterday and have almost all of the trailer wiring completed except..........................

    Got to the interior firewall and cannot find a place to thread the power wire through to the battery.

    This is the 5th trailer wiring that I have installed over the years and have never been as baffled as I am with my 2018 CX-5.

    Mazda really has this vehicle buttoned up tight. Usually there is an unused rubber plug somewhere but for the life of me, I don't know where it is or even if one exists.

    Any advice will be greatly appreciated.
    2018 CX-5 Grand Touring Snowflake White Pearl----2016 MX-5 GT Soft Top Ceramic White Metallic.

  2. #2
    Registrierte Benutzer Chris_Top_Her's Avatar
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    On the gen1's the pass through is on the upper left corner (maybe right) above the gas/brake pedals.. there is a rubber grommet where the wiring harness goes through.

  3. #3
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    2018, Mazda, CX-5, Snowflake Pearl, Grand Touring

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    Quote Originally Posted by Chris_Top_Her View Post
    On the gen1's the pass through is on the upper left corner (maybe right) above the gas/brake pedals.. there is a rubber grommet where the wiring harness goes through.
    Thanks for responding.

    I saw that and apparently the Gen 2 is the same. However, it is apparently very thick. I tried to penetrate it with a heavy duty coat hanger wire to no avail.

    I may try it again tomorrow after I grind a sharp point on the end of it.
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  4. #4
    Registrierte Benutzer Chris_Top_Her's Avatar
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    careful not to nick a wire
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  5. #5
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    2018, Mazda, CX-5, Snowflake Pearl, Grand Touring

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    For sure. I was extremely careful when I was prodding that area.

    My puncture efforts were aimed more to the side of the rubber grommet which is why the rubber is so thick there. Was staying as far away from the wire bundle as possible.

    In the past, about half of my trailer wiring efforts were running the power wire under the car. This time, I wanted to keep the wire inside for a neater and safer install.

    I should have taken it along the underside of the vehicle. Would have made my job so much easier. There is a large, unused plastic plug, that gives direct access to the undercarriage at the back end of the cargo area on the floor. I used that access to run my trailer hook up pigtail to the hitch.

    Oh well, I'll eventually get it figured out. At least the Hitch is installed and the trailer lights wiring is about 90% complete.
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  6. #6
    Registered Member tibimakai's Avatar

    2014 Mazda CX-5 Touring

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    When I have run my amp wire, I have used one of these(not exactly this one though):
    http://www.evwest.com/catalog/produc...roducts_id=431

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