View Full Version : No spark on mercury 150

08-26-2019, 12:10 PM
I have a 2008 mercury 150 opitmax outboard, couple of weeks ago the motor started missing and running rough. Ran it for about an hour then it just died, would not start again. I pulled spark plugs they were wet and burned, I replaced them and still would not start. I checked for spark in plugs but there was none. My mechanic canít get to it for about a month. Does someone have an idea on what is wrong or had this problem?

08-26-2019, 02:41 PM
See my thread on my '92 Merc 4 cylinder 2 stroke with the same problem: http://www.marineengine.com/boat-forum/showthread.php?458768-Yet-Another-Merc-40-2-Stroke-With-No-Spark. Have shop manual and it walked me thru diagnosing my bad stator; one component I could not test was the switch box - place where most wires terminate - center of picture.