I have a Mercruiser 3.0lx. Turn the key and get clicking noise. I've looked through the FORUM but seem to find the same answers. New Fully charged battery.Connections all tight and clean. Tried jumping it with same clicking noise. Tried tapping it with a hammer. It appears that the starter isn't engaging the flywheel. I've been told that the interrupter switch could cause this. But the boat is out of water and on muffs. The Flywheel will turn manually.