Get either the Seloc or the Clymer manual for your engine model and year... then follow the instructions contained within step by step. It's really not a hard job, and one that you should know anyways.. replacing the impeller at the start of the yearly boating season is actually a pretty good form of insurance against overheating and burning out your engine.

Decided to go ahead and replace the whole pump took about an hour and a half. Not too bad and hey I learned something too!

Poltergeist? Yeah, maybe,
 

...but I wonder whether it's a pesky neighbor or a kid pulling a prank. Got any enemies? I'll admit I don't know enough about spontaneous starting. It's enough of an effort to get the thing to start when I WANT it to start, let along something interesting like you've got. Still, I was pondering replacing the impeller for regular maintenance, and it's good to have a handle on how little time it takes. Thanks!
Dave:beer:

Talked to my mechanic and he affirmed the water in the ignition switch. Reminded me to always use the battery switch. Lesson learned.

So I took her out yesterday for a test run ra great I was a little concerned the water temp. She usually ran about 165 to 170 now shes running at 175 to 180. A little hot right? gonna check the thermostat tonight maybe some trash in it or something. Thoughts?