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  1. #1
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    2.0/2.4/2.5 ECU Wire Diagram

    Drew this up real quick cause I found myself looking at the old a** mercury books and barely being able to read or trace the wiring.
    Just throwing this out there in case anyone else ever needs to track these wires. I find it a little easier to read.

    Click image for larger version. 

Name:	efi wIRING dIAGRAM-Model.jpg 
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    8' Yellow Jacket - 25 hp Mariner
    1984 Hst VKing - 15" Bridgeport EFI
    1990 Collins Mirage - 15" 260
    22' Aquasport - 150 SeaPro Fourstroke

    25 hp Merc that runs on ACETONE
    25 hp Merc with dry side pipe
    25 hp Merc with 11" mid and 2.42:1 gears


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  3. #2
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    My book seemed clear.
    Attached Thumbnails Attached Thumbnails 244FA40A-80A3-4135-A1AA-51F1841B02D3.png  

  4. #3
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    Thanks for creating and sharing, Jacob. Nice of you to do that.

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  6. #4
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    Quote Originally Posted by Stoker boy View Post
    My book seemed clear.
    And your diagram is actually correct, where mine (genuine Merc book) is wrong.

  7. #5
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    I just have the standard 2.5 Mercury high-performance book.

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  9. #6
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    Quote Originally Posted by 25two.stroke View Post
    Drew this up real quick cause I found myself looking at the old a** mercury books and barely being able to read or trace the wiring. Just throwing this out there in case anyone else ever needs to track these wires. I find it a little easier to read.
    Click image for larger version. 

Name:	efi wIRING dIAGRAM-Model.jpg 
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    I made up a test box that plugs directly into the Mercury factory laser ECU connectors for testing and troubleshooting to eliminate special Mercury test cables or having to spike into wires damaging insulation I also drew up my own Schematic diagram showing all of the inputs and outputs for the ECU
    Attached Thumbnails Attached Thumbnails box1.JPG   Merc_ECU_Schematic.jpg  

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  11. #7
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    Okie ,

    Very nice work , I have the upmost respect for guys like you and Pan Ronnie who have an advanced understanding of electronics. To me , those green boards look like an areal view of a big city , taken from a drone ...





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  13. #8
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    Click image for larger version. 

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  14. #9
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    Quote Originally Posted by 25two.stroke View Post
    Click image for larger version. 

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    YIKES !!! Are those pins corroded or is that just dried out grease?

  15. #10
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    Quote Originally Posted by H2Okie View Post
    YIKES !!! Are those pins corroded or is that just dried out grease?
    Thats factory fresh clear grease! Like day 1.

  16. #11
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    Revised to show alignment bumps.
    Click image for larger version. 

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  17. #12
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    Quote Originally Posted by 25two.stroke View Post
    Revised to show alignment bumps.
    Click image for larger version. 

Name:	efi wIRING dIAGRAM-Model.jpg 
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    Pin 2 is Fuel pump
    Pin 4 is Detonation sensor 200 and 225 motors only

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