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  1. #1
    Cadet Registered
    Join Date
    Jun 2011
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    2

    Default Help! need 1985 mercury 120Hp I/O wiring diagram

    Need 1985 mercury 120HP I/O wiring diagram to troubleshoot. Won't start for the first time. Thanks!!

  2. #2
    Admiral
    Join Date
    Aug 2004
    Location
    East coast NJ
    Posts
    6,864

    Default Re: Help! need 1985 mercury 120Hp I/O wiring diagram

    What does that mean exactly. "wont start"
    turn over
    actually run
    does nothing, not even click
    battery dead
    no power to coil
    man overboard switch activated
    shift interlock activated
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

  3. #3
    Cadet Registered
    Join Date
    Jun 2011
    Posts
    2

    Default Re: Help! need 1985 mercury 120Hp I/O wiring diagram

    Well, the motor will turn over, there's power to the coil, and the carb has gas. New spark plugs, distributor cap, points and rotor last spring fixed the same issue, don't want to replace all that again this year. any thoughts? Thanks!

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