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HID Relay Harness

Discussion in 'Gen 3 Prius Accessories and Modifications' started by slowpriusj, Jan 28, 2015.

  1. slowpriusj

    slowpriusj Active Member

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    Hey Prius Gen III owners! I recently just purchased my 2010 Prius and the first mod I did was add new projectors/HID's. Upon ordering this kit I did not get the relay harness that a lot of people on here say we need, and I personally could not find a direct yes or no to whether we need this or not, so the answer is no. If someone would like to chime in please feel free! I've used my headlights for a total of 2 hours so as of now, no issues!

    I also would like to add I drove my car around with my headlights out to see if a bulb out warning would come on and nothing. Also, if we add LED's to turn signals will this create a hyper flash? Thanks!
     
    #1 slowpriusj, Jan 28, 2015
    Last edited: Jan 28, 2015
  2. okdonk

    okdonk Junior Member

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    I did not use relay/ harness kit on my 2015 Prius. They work and no issues at all.

    Yes you need relay to prevent hyper flash when installing LEDs for turn signals.
     
    #2 okdonk, Jan 28, 2015
  3. slowpriusj

    slowpriusj Active Member

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    Thanks, reason I ask is when I had my car apart, and used turn signals on it didn't hyperflash but I do not know...
     
    #3 slowpriusj, Jan 28, 2015
  4. ray_prius3

    ray_prius3 Junior Member

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    Still no issues? (Hopefully)
    I'm about to install HIDs too. I bought the relay harness just in case, but theres really no install relay guide for the Prius.
     
    #4 ray_prius3, Sep 1, 2015
  5. slowpriusj

    slowpriusj Active Member

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    You will be fine it seems to be only Chrysler/German cars that need a relay harness, and I couldn't tell you where or how to install it.
     
    #5 slowpriusj, Sep 1, 2015
  6. mrbigh

    mrbigh Prius Absolutum Dominium

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    It has been a headlamp wiring issue on MY 2010 vehicles, these are in need of the relay harness.
    On our 2011 and 2012 PiP, I installed the HID's with the relay harness regardless.
    I does make a better and proper install.
     
    #6 mrbigh, Sep 1, 2015
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  7. slowpriusj

    slowpriusj Active Member

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    To each his own, I've ran my hids w/o it for 9 months and I'm trouble free!
     
    #7 slowpriusj, Sep 1, 2015
    ray_prius3 likes this.
  8. ray_prius3

    ray_prius3 Junior Member

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    Thanks for your responses. I kinda figured out how to install them. Just waiting on the actual HIDs to come in. :D
     
    #8 ray_prius3, Sep 3, 2015
  9. ray_prius3

    ray_prius3 Junior Member

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    [​IMG]

    So I properly installed my HIDs, but I couldn't install my relay harness. I have no idea how to open the little lid that covers the positive battery connection in the fuse box. Can anyone help with how this is done?
     
    #9 ray_prius3, Sep 6, 2015
  10. xliderider

    xliderider Senior Member

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    Just connect your power wire to one of the two open terminals at the rear of the fuse box, where the two red wires are in the pic below. It's much easier to use them, just use a quarter inch push on terminal:

    [​IMG]

    In the pic, you can also see the positive bolt you are trying to get to for power. If I recall correctly, you have to use a small screwdriver to pry the clip that holds the cover on to access the bolt.
     
    #10 xliderider, Sep 6, 2015
  11. ray_prius3

    ray_prius3 Junior Member

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    Thanks! I'll try that. I spent about 20 minutes before giving up. Maybe the philips screw driver wasn't small enough.
     
    #11 ray_prius3, Sep 7, 2015
  12. ray_prius3

    ray_prius3 Junior Member

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    OK, this is my positive connector. How can I get it to connect to one of these terminals?

    [​IMG]
     
    #12 ray_prius3, Sep 8, 2015
  13. xliderider

    xliderider Senior Member

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    You would have to cut the ring terminal off and replace it with a quarter inch push on terminal. Or you could leave the ring terminal on and put it under the bolt.
     
    #13 xliderider, Sep 9, 2015
  14. ray_prius3

    ray_prius3 Junior Member

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    So my relay setup worked. This is how I zip tied it. Anyone see any possible issues?

    [​IMG]
     
    #14 ray_prius3, Sep 16, 2015
  15. xliderider

    xliderider Senior Member

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    Your pic isn't showing up for me on either my smartphone (Tap a Talk) or PC (Chrome).

    Keep the wiring away from heat sources like the radiator or exhaust manifold, or moving parts (fans), and you should be good.
     
    #15 xliderider, Sep 16, 2015
  16. bongsta213

    bongsta213 Junior Member

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    which brand did you guys buy?
     
    #16 bongsta213, Sep 17, 2015
  17. ray_prius3

    ray_prius3 Junior Member

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    Here's the direct link to the photo: http://s10.postimg.org/y8s5sv1if/IMG_2989_2.jpg

    I don't think it's covering anything that you mentioned (or at least I hope not).
     
    #17 ray_prius3, Sep 17, 2015
  18. ray_prius3

    ray_prius3 Junior Member

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    I got mine from DDM.
     
    #18 ray_prius3, Sep 17, 2015
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