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Thread: New Stereo Head Unit Install Help

  1. #1
    Join Date
    Jul 2007
    Location
    Mercer Island
    Posts
    4
    My Cars
    1990 BMW 535i

    New Stereo Head Unit Install Help

    I have some confusion on how to install this head unit. I thought that if I were to remove the stock head unit I could remove the black plug pictured below.

    But I can't figure out how to remove that plug, if it's even possible. If it's not possible I assume I have to start cutting the factory wiring and wiring directly into the head unit harness?

    Below are the relevant pictures, along with the adapter wired up to the new harness.

    IMG_2703.jpgIMG_2704.jpgIMG_2706.jpg

  2. #2
    Join Date
    Dec 2006
    Location
    warwick RI
    Posts
    2,522
    My Cars
    E30/E32/F25
    Wow that’s an early radio looks like my e24. So the yellow and blue should have a home in the radio you pictured. They are your speakers under your orange fuse where it says L \ R. White wire is power antenna/ amp power. From memory I can’t remember e34 early cars but white purple should be switched power. red green should be constant or “memory” . and brown ground (these are e30 colors so they may vary, use a test light to find properly).... now from memory again your top plug of radio left to right is ground (brown), power antenna (white), the last two should be your powers. You Might need to make some connections useing insulated spades if the connectors don’t match

    oh shoot I’m sorry are you installing the after market or oem?
    Last edited by e30luv318i; 05-21-2018 at 09:39 PM.
    Me E30 87/ 325i + F25 12/ M-Sport + E32 94/ 740i

    G/F’s E34 92/ 525iT + F48 18/ X1

  3. #3
    Join Date
    Jul 2007
    Location
    Mercer Island
    Posts
    4
    My Cars
    1990 BMW 535i
    Thanks for all that info! I’m installing an aftermarket. What is the gray tube thing with two brown wires? I think I have all the others figured out

  4. #4
    Join Date
    Dec 2006
    Location
    warwick RI
    Posts
    2,522
    My Cars
    E30/E32/F25
    That’s a ground for the actual radio case. Just ground it
    Me E30 87/ 325i + F25 12/ M-Sport + E32 94/ 740i

    G/F’s E34 92/ 525iT + F48 18/ X1

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