90 Hp Mercury Outboard Wiring Diagram - Simple Wiring Diagram
The 9.9 hp motors covered in this article, came into being in 1974. As for actual physical differences between the 9.9 and the 15 hp that you could use for identification other than the decal markings, year by year these 2 hp sizes and brands are the same.. Tachometer is not working correctly. Once in awhile it will try to work and quit. I have traced the wiring down to the side of the carbs. The part looks like a fuel pump with vacuum lines and a couple of wires.The diagram shows a purple wire that goes from the tach to the wiring harness at the engine.. Easy to install. Works smoothly. Used to replace a bad ignition seitch on our 1986 bomber scout bass boat with a 55HP Johnson. Mine came with wiring diagram which I have included for those who may still receive a unit without a diagram..
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