Hi guys... I have a 2008 Hustler Super Z that won't start. I turn the key all the way, and hear a loud KNOCK, sounds like it's coming from under the shroud. If I hold the key in the ignition, the fuse will blow. Nothing cranks, just a loud KNOCK and a few seconds later, blown fuse. Any ideas? I was forced to leave the machine out exposed to the rain for a few days, maybe this caused a problem?