for some reason i can start my boat take it out all day , kill it, sit and hang out for awhile then get back in to start the boat but will not turn over..i have to get back there and move the starter relay or just mess with it then it will finally fire up and turn over. it is a volvo penta 3.0GS ..just wondering what is this? a short in a wire maybe? i am new to boating as well, so be generous haha