BMW 525i E34 1988 -- White and yellow... which is power and which is illumination?

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  1. BMW 525i E34 1988 -- White and yellow... which is power and which is illumination? 
    #1
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    Jimmetry's Car Details
    Model of Car:
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    Upgraded my stereo and I'm having issues... looks like I made a mistake in the wiring. I couldn't find any information on it... but without going into detail my question is this:

    For older E34s (pre-harness) there's a two-pin plug... on the old radio the wires are yellow and white, but at the other end of the plug they are red and black. One is power and the other appears to be illumination. Which is which?

    I can probably just measure it, but my car is quite a distance away (I've decided to make an adapter). Hoping to get a quick easy response on here or a link to wiring info (I couldn't find any more than a photo in all my Googling)... testing is plan B.
     
     

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    #2
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    TheEnd's Car Details
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    You should find a manual here
    http://www.wedophones.com/BMWManualsLead.htm

    The wiring colours are noted in German still,
    so SW- Black
    GB- Yellow
    WS- White
    RT- Red
    GN- Green
    VI- Voilet
    BL- Blue
     
     

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    #3
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    mikesmith2's Car Details
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    If you have red and black on one side then it should be positive and negative.
     
     

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    #4
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    thepurpleblob's Car Details
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    Don't chance it... you can get a simple test probe or, better yet, a basic multimeter cheaply and that will settle it.
     
     

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    #5
    Bimmer Fan
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    Jimmetry's Car Details
    Model of Car:
    525i E34
    Year of Manufacture:
    1988
    Transmission Type:
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    Couldn't find anything useful in the manual. I knew one was power and the other was illumination because after desoldering the sockets from the old radio there were two labels on the PCB – "BAT" and "ILL", though I didn't know which wire came from where. So I took a guess with the adapter and then confirmed with a multimeter before plugging it in. Constant 12.6V from the red while the car was off.

    So: Red (Yellow) is +12V, Black (White) is Illumination, and everything works. Thanks guys.
     
     

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