Quick headlight wiring question
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This is a discussion on Quick headlight wiring question within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; On the stock headlight plug (9007 2003 wrx). There are three wires. Blue/White, Red, and Yellow/Red. I need to know ...

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    Registered User GarrettKoonsman's Avatar
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    Quick headlight wiring question

    On the stock headlight plug (9007 2003 wrx). There are three wires. Blue/White, Red, and Yellow/Red. I need to know which of these is the high beam control. Im assuming red is 12v power, and my guess is yellow/red is ground?? Im not really sure, either way all i need to know is which one is the 12v high beam control. If for whatever reason none of these are a 12v high beam i need to know where to find that wire and what color it is. Thanks
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    Registered User GarrettKoonsman's Avatar
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    anyone? If not guess i'll be taking a test light out there in the morning and figuring it out
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    He simply abides. SD_GR's Avatar
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    See the diagramme attached. LW is the code for blue/white. Notice that the two filaments share a common positive. This is a switched negative system -- the ground is switched, not the power. Notice that it is LW that goes to the fuse box, not R or YR. These two both end up to earth (they ground).

    What is it that you are trying to do? Someone may have already figured out a circuit for your particular application.
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    Registered User GarrettKoonsman's Avatar
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    Quote Originally Posted by SD_GR View Post
    See the diagramme attached. LW is the code for blue/white. Notice that the two filaments share a common positive. This is a switched negative system -- the ground is switched, not the power. Notice that it is LW that goes to the fuse box, not R or YR. These two both end up to earth (they ground).

    What is it that you are trying to do? Someone may have already figured out a circuit for your particular application.
    im wiring my garage door opener to open with a flash of my high beams. Found a DIY and all i need is a 12v activiated by the high beam and a ground. Ground is easy, i just need to know where to find a wire that will only supply 12v when the brights are on
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    Admiral Ackbar the 1st mycologist's Avatar
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    Maybe the one that goes to the high beam indicator in the cluster?
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    hey mate - im an auto electrician.
    on any type of headlight wiring there is always a power feed for that circuit e..g. high beam power

    if there is negative switching at the headlights u can:

    1 - find power at the cluster or the headlight switch
    2- wire this up as if u were wiring in spotlights which need the high beam trigger.

    now three wire bulbs are usually high and low beam

    all u do is join a twin core wire on the COMMON side of the headlight- and the other wire on the opposite end
    the little diagram below shows three terminals and the stars show which ones to join to...

    - - -
    * *

    now one of those wires have to be cut and put across the coil of a stardard relay - terminals 85 -86

    then join the end of that twin core wire together


    85 86
    _________l l___________________
    _________________________________/* join these two


    the terminal 30 on the relay is put through a fuse to battery positive

    the terminal 87 on the relay goes out as the HIGH BEAM power to your unit

    see how u go. let ur imagination run wild! just dont let the smoke out!!

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