1998 Crownline / 5.0 liter Mercruiser / engine hours 160 - boat has started fine all Summer until about one month ago, after sitting unused for 1 and 1/2 months , took boat to lake, battery could not pull lower unit up and bilge fan was turning very slow. I replaced the battery (625 CCA) as the old one was 5 years old. Now when I crank the engine it turns over very slow or not at all. Battery gauge on dashboard reads about 12 V. boat is stored on a trailer, tilted with bilge plug open to keep any water draining out so starter has never been submerged. Am I looking at a bad starter? Starter has not shown any slow crank symptoms ever until now. Boat has always been in fresh water.