Hey guys! I have a fairly straight forward diagnosing process for diagnosing the no spark on these switch box years of Mercury. They seem to be one of the more common motors to have issues with spark. I hope this gets you through quick and back on the water. Any questions or comments please ask. Thanks
Hey, so last night my engine stalled out twice until it shut off and wouldn't come back on. The next day I tested the spark plugs but only 3 out of the six showed spark. The 3 that didn't work were on the starboard side. Do you have an idea what could be causing this?