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  1. M

    1979 merc 40 wiring questions

    I have a 79 merc 40 hp with the external harness plug on the left side of the motor. I want to know if I have to use the plug or if i can cut if off and just run wires straight in the motor through that plug hole and to their destinations. Thanks in advance.
  2. M

    wiring problem on 1979 merc 40

    I have a 1979 mercury 40hp, and I bought a non running 1980 mercury 40 hp for parts. I needed the ignition switch box from the 1980 because the one on the 1979 was melted. I have checked the part number and the switch boxes are interchangeable. However, the wire colors are slightly different on...
  3. M

    1980 Merc 40 cylinder lost compression, swap with 1979 merc 40?

    I have a 1979 merc 40hp currently on my boat. I rebuilt the starter, got the motor to turn over, and found that I have good compression in both cylinders, but no spark. this is due to a completely melted igntition switch box. Today I bought a 1980 merc 40hp to use the parts from it on my 79...
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