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Thread: Looking for an "add an amp" harness.

  1. #1
    Join Date
    Nov 2019
    Location
    W. Boylston, Ma.
    Posts
    12
    My Cars
    12 128i, 94 945, 90 780

    Looking for an "add an amp" harness.

    I haven't been able to find a harness that attaches to my factory radio and then to my factory harness. Basically I need a piggyback harness.

    My intention is to install a mini-amp but without actually tapping into the factory wiring.

    Anyone ever heard of this? I was able to get one for my Volvo fairly easily, but for the BMW I've only seen these for the Android interface.

    I think it was called an "add an amp" harness".

    The closest I could find is something like this:
    https://www.amazon.com/Amplifier-Ada.../dp/B07QLJTT8V

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    We need the year, model and factory audio info.

  3. #3
    Join Date
    Nov 2019
    Location
    W. Boylston, Ma.
    Posts
    12
    My Cars
    12 128i, 94 945, 90 780
    2012 128i

  4. #4
    Join Date
    Sep 2005
    Location
    Peoria, AZ
    Posts
    7,696
    My Cars
    03 zhp, 97 e36m3, 04 zhp

  5. #5
    Join Date
    Nov 2019
    Location
    W. Boylston, Ma.
    Posts
    12
    My Cars
    12 128i, 94 945, 90 780
    I did that, but it's NLA.

  6. #6
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    Modern BMW audio systems tend to be “closed” sys to end in that it can be difficult to mod the system without custom made cables, etc. What you can do is tap into the rear speakers’ wires and use those speaker level signals as the inputs for the new amp. The new amp should have it’s positive (+) input tied to the battery with a fused cable. The ground cable needs to be tied to the chassis/body with the shortest cable (of the same gauge as the positive cable) possible. The “remote turn onl signal can come from the factory amp’s harness.

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