I cant get my 2009 Merc 9.9 to start, or even to act like it might start.. The motor appears to be near new, no corrosion anywhere. I checked for spark on both cylinders with an in-line tester, and no spark. I also disconnected the black/yellow wire leading to the kill and tiller stop switches and still no spark. It ran and trolled fine two weeks ago on my first outing. Anybody know what I should try next?