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Wiring through the firewall, easiest place to poke through?

Discussion in 'Gen 2 Prius Accessories & Modifications' started by Bunce, Mar 13, 2021.

  1. Bunce

    Bunce Active Member

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    Hiya guys.
    I did a bunch of searching and reading but couldn't find what I was looking for. I got this cheapo fog light kit https://amzn.to/3rMEh0j


    The grilles are awful quality, but the wiring harness looks to be decent and convenient, even though there's some weird lengths of wiring if it's supposed to be a custom fit.

    Anyway, I'm looking for a simple place to poke the wires through for the switch.
    And how to get access to the blank next to the dash dimming switch.

    Any advice?
     
  2. Cateran

    Cateran Junior Member

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    There is the rubber cap with two mastoids on the right which is useful to wire the cables through the firewall.
    p1.jpg p2.jpg p3.jpg p4.jpg p5.jpg p6.jpg
     
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  3. 69shovlhed

    69shovlhed Surly tree hugger

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    sorry for the highjack but tell me about that nifty little charging volt gauge insert in the last pic!
     
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  4. Cateran

    Cateran Junior Member

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    I bought it from aliexpress.
     
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  5. ebxgsxr

    ebxgsxr New Member

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    i'm impressed that you have a light indicator on the dash for the fog lights, lol.
     
  6. Cateran

    Cateran Junior Member

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    How about the indicators for EV, DRL and Automatic light? Currently, the functionalities of EV and Automatic light are all done.
    p7.jpg
     
  7. Nolan the g

    Nolan the g New Member

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  8. TheForce

    TheForce Stop War! Lets Rave! Make Love!

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    I was wanting to make an EV indicator back in the day. I was planning on etching on and using an LED with my can-view to make everything work but I never really officially started the project. Not that I want to do it now but how did you do this?
     
  9. Cateran

    Cateran Junior Member

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    Because of the different version of the boards I am not pretty sure, in my opinion, you may not need the can-view as a decoder. At least, I don't need it in my case. All you need is a pin for scraping the paint, an IC or transistor as an LED driver, some LEDs and resistors, colored film or paint if you prefer a different color like brown instead of white, red, Blue, green etc. of basic color LEDs. Or, you can buy color-tunable LEDs. You also need the wrapping wires, solder wire and iron. Here is the link below I ever posted on the forum about some records of my EV indicator:

    EV indicator
     
  10. Cateran

    Cateran Junior Member

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    Sorry for replying so late.

    It is not necessary to install all the wires through the firewall. I poked at one of the two mastoids on the left grommet on the second pic, then only ran the control wire from the fog switch through the hole in the mastoid to the relay on the third pic. In addition, the power cable for the fog lamps comes from the original fog lamp fuse in the main fuse box on the driver's side in the engine compartment. So it almost looks like the original manufactured wiring.

    By the way, I forgot to clearly state that the grommet locates on the passenger side of the engine bay where the arrow points in the third photo.
     
    #10 Cateran, Aug 16, 2022
    Last edited: Aug 16, 2022