Spark Problem

[wannagofishin]

I've got an '82 40 HP Merc (2 cylinder) with no spark on the top. I thought it was the coil but I switched the wires from the switchbox and got fire.
So, my question is - can a switchbox go bad on one side only? Can the problem be further up the line to the stator?

Thanks for your time,

Dan

 

[Texasmark]

Re: Spark Problem

I'll bump this up for you so that Laddies, Silvertip, Clams Canino, or WillyBWright may catch it. They can probably answer your question.

Mark

 

[wannagofishin]

Re: Spark Problem

Thanks,

I was hoping someone with knowledge would be on here. Laddies was a great help on my old 25 Merc about two years ago. Wish I still had that engine!

Dan

 

[The-Machinist]

Re: Spark Problem

I had the exact same problem with a 402 merc a while back. While it was an expensive risk, I went ahead and replaced the switch box. It fixed every problem I was having.

 

[ricksrster]

Re: Spark Problem

Check the Trigger. Disconnect the Brown/white and the Brown/Yellow wires from the switch box. Test the resistance between them. You should have 750-1400 Ohms. If not you have a bad trigger. If you do get these readings then Check voltage going ti coils from the switch box. Each coil should have 180V+.