wiring a new head unit
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This is a discussion on wiring a new head unit within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; Hello, I'm a complete DIY newb. I am trying to install an aftermarket head unit on my '10 WRX. I've ...

  1. #1
    Registered User gimli's Avatar
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    Dec 2009
    Des Moines, IA

    wiring a new head unit


    I'm a complete DIY newb. I am trying to install an aftermarket head unit on my '10 WRX. I've gone through all the threads here and in NASIOC. They all assume that you know how to do wiring. What is the proper technique to connect the little colored wires from the head unit to the adapter? Do I just cut those cables, twist them together, and tape them? I don't want to create an unsafe mess. Thanks.

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  3. #2
    Registered User mudferret's Avatar
    Join Date
    Aug 2009
    Ultimately you want to solder them to ensure a quality connection. Spade connectors can be used.

    Don't just twist the wires together.
    MMVI WRX - VF43 Airboy Tuned @ 3500'

  4. #3
    Registered User jph38's Avatar
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    Jun 2009
    Beaufort SC / Lamar CO
    after solder use heat shrink wrap around it to insure no shorts and for a clean look

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  6. #4
    Registered User vttk_mig69's Avatar
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    Jan 2008
    Sheboygan, WI
    for the sake of giving your self a headace, get a wiring kit for your car and do not cut the stock harness out.

  7. #5
    The Fruit mangostick's Avatar
    Join Date
    Oct 2009
    VB VA .. the ghetto on the sea
    you can solder, thats the best and most secure way.. OR you can use butt connectors with the proper crimping tool. One that will not release until you've put enough pressure on the crimp to have a solid connection. Here is a pic of what I made for my 2010.. now you dont have to get molex connectors and go this complicated.. but if you ever want to put that new head unit into another car it makes things easier.

    What I did here was add a 20pin molex connector between the Pioneer harness and the adapter harness to connect to the factory car wiring. This way its all plug and play.

    the color coding between the scosche adapter harness and the new head unit wiring should be the same. switch power is red, constant power is yellow, ground is black.. front speakers are white and grey, rears are green n purple. Pay attention to the stripes as they have to match or your left will be right etc. If you haven't gotten the adapter harness to connect to your factory wiring, get one. It makes things much easier. It sounds like you already got one of those though
    OBP 2010 5dr *traded*
    SWP 2013 FRS
    My name is Shawn, I'm a Devout Practicalist and I'm addicted to flat4's
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