1985 Mercury 75 HP

[Speed74]

I am troubleshooting an ignition problem on a 1985 Mercury 75 HP. Engine has no spark at all. Good compression on all 4 cylinders, no fuel issues. Engine was running, then died and has had no spark since. Any ideas on what the issue could be?

 

[roscoe]

Simplest would be the kill switch was activated, or shorted, or the keyed switch is shot.
Check the wires on the back of the ignition switch and the kill switch.

 

[Chris1956]

You might repost this in the Mercury forum.

Disconnect the black/yellow wire at the switchbox. This wire kills spark.

Also, inspect the other wiring for loss of insulation. conductor breaks etc.