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Mercury inline six wiring diagram?

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  • Mercury inline six wiring diagram?

    I have a 1974 150 inline six mercury outboard and I need to "hot wire" it to get it started due to bad wiring in the boat. I need to know more about the wires coming out of the switchbox. From top to bottom, the first one goes to the coil, and the third one is positive, what are the other two? I think they run to the front of the boat where the key is, do they just need to be crossed for the motor to run?

    If anybody knows where I could find a complete wiring diagram I would love it, my shop manual got destroyed.


  • #2
    Re: Mercury inline six wiring diagram?

    Hello DirtyOldBoat,
    Found a link to online, downloadable manuals... www.repairmanuals4u.com

    I forgot where on this site, I found the link, but it was posted here in iboat.com, and led to a free download of the manual... if I find it agan, I will give it to you.
    I downloaded it on Adobe PDF file.

    Also SELOC manuals has a Mercury Outboards Manual #1408, that covers 1965-1989, 90-300HP, Inline 6 and V-6, 2-Stroke Models. I got mine through Amazon.com for about 23.00 dollars. It has all of the wiring diagrams in the appendix.

    Best Regards,gt
    Why a Fiberglass Boat?...Because they are,"The more beautiful, more seaworthy, more elegant, more easier to get chicks in, nicer, more common, more socially accepted, more politically correct boats."Quote by oops!
    Tight Lines and Float, Float On!
    Links to everything having to do with this restoration...
    1988/2014 Glasstream Resto-Mod
    INDEX...
    PAGE ONE
    PAGE TWO
    PAGE THREE
    PAGE FOUR
    Trailer Thread

    Comment



    • #3
      Re: Mercury inline six wiring diagram?

      DOB, Look at the second Sticky post, at the beginning of this forum... "FAQ for Mercury/Mariner Outboards"... that is where the link to the manual is at...
      Why a Fiberglass Boat?...Because they are,"The more beautiful, more seaworthy, more elegant, more easier to get chicks in, nicer, more common, more socially accepted, more politically correct boats."Quote by oops!
      Tight Lines and Float, Float On!
      Links to everything having to do with this restoration...
      1988/2014 Glasstream Resto-Mod
      INDEX...
      PAGE ONE
      PAGE TWO
      PAGE THREE
      PAGE FOUR
      Trailer Thread

      Comment



      • #4
        Re: Mercury inline six wiring diagram?

        Without a s/n of your engine it is hard to guarantee the year but here are two diagrams you can check:

        Merc 1150-1350-1400-1500 Thunderbolt.....Ignition & External Wiring Diagram

        Merc Model 900-1150-1500........1976-78 Wiring Diagram

        http://www.maxrules.com/mercwireindex.html

        Gerry

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        • #5
          Re: Mercury inline six wiring diagram?

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          • #6
            Re: Mercury inline six wiring diagram?

            Thanks everyone, that's EXACTLY what I was looking for!

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