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    2003 Mercury 25 2 stroke Internal Wiring Diagram

    Specifically I have a black with yellow stripe wire that looks like it comes from the switchbox that goes to the original wiring harness. The new harness does not have this color wire. The engine harness is the same part # as the original. I have matched up all the other wires except this one. I...
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    2003 Mercury 25 2 stroke Internal Wiring Diagram

    I am replacing my internal wiring harness on my 2003 Mercury 25 2 stroke OT763455 and have found that the colors are different on the new harness. Does anyone have an internal wiring diagram for this outboard? Thanks
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    Wiring Harness Meltdown

    Can a rectifier overvolt the charging system and produce the kind of damage seen in the pictures? Is there a way to check the voltage produced by the rectifer?
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    Wiring Harness Meltdown

    Maybe to much resistance on the main power cables running to the battery? I have 2 GA cables. Or a loose connection? Is there a way to test resistance with a multimeter?
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    Wiring Harness Meltdown

    I only have 1 motor 2 batteries. The wire comes from the rectifier and runs to the kill switch on the shifter controls. It's a black wire which would indicate a ground wire. n it's a ground
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    Wiring Harness Meltdown

    When I replace the internal and external wiring harness what am I looking for to avoid another meltdown?
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    Wiring Harness Meltdown

    Can you explain what this means. Looks like I have to replace 2 wiring harness and I dont want to repeat this mistake. Thanks
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    Wiring Harness Meltdown

    I have a 2003 Mercury 25 2 stroke that has a serious wiring harness issue. The black ground wire melted from the inside the motor all the way through the wiring harness into the control box. What could have caused this? I have 2 batteries wired through a main switch as pictured. Any help would...
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    2003 25 2 Stroke Carb Kit

    Thank you, I was looking for an older obsolete part number.
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    2003 25 2 Stroke Carb Kit

    I have a 2003 Mercury 25 EL Serial # OT763455 that needs a carb rebuild. I can't seem to find anyone that sells a carb kit. Have they been discontinued? Can anyone point me in the direction of someone who has these for sale? Any help would be appreciated. Thanks
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    2003 Mercury 25 2 stroke battery Cables

    I recently acquired a 2003 Mercury 25 HP 2 stroke Serial # OT763455 that has a wiring harness but no battery cables. My question is where does the negative cable from the battery get grounded? The positive cable goes to the starter solenoid correct?
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