I recently purchased a boat with a 1987 100hp Mariner engine. The engine has not been started in a couple of years. I just replaced the ignition switch and when I attemped to start the motor, it would turn over but not run. I tried a few more times but stoped when I found that the negative terminal on the battery was too hot to touch. I also noticed the starter seemed overly hot. What steps should I take to get this motor running properly again?