found that slight miss on 140 mercruiser

[fishingdeal007]

I finally found why my motor was missing. Im not getting the correct voltage at the coil. I ran a jumper from the positive on the solenoid to the positive on the coil and it ran great as a test so I replaced the switch and Im back with the same miss. Theres a purple wire with a yellow stripe and a dark pink wire at the positive side of the coil. Run a jumper it runs great, maybe my dark pink wire is shorted or is there a way to run a new wire. Thanks

 

[Fishermark]

Re: found that slight miss on 140 mercruiser

That dark pink wire is supposed to be purple I think - it is probably faded. Anyway - that is your resistor wire. It might have increased resistance now due to age, heat, etc. You cannot keep running the engine on the jumper wire or you will burn up your coil and points. I recently changed the points and resistor wire set up on my dad's boat to the petronix electronic igniton set up. That way you can replace the coil with an internally resisted one. Simply add a switched 12v line to your coil and you are good to go!