As the title says. So I was working on the Ski. The exhaust manifold had come loose so I ordered all new gaskets and took it apart, cleaned it up and put it all back together. After doing so I made the grave mistake of connecting my battery cables backwards (very briefly) I realized this and corrected them. I went to start the skiÖ. Nothing. Iíve tried replacing the starter solenoid relay as well as the MPEM to no avail. It was running great before this, Iím so discouraged. Any help would be GREATLY appreciated!

thank you!