I have a 1985 Chriscraft Concept 19 that stays on a lift. Went out yesterday and rode the lake for about two hours with no problems. Came back to the lift and shut it off like normal. Now when I try to start it the starter gear engages the flywheel but wont turn the motor over much. Sometimes it will turn the engine slightly. Charged the battery fully and had it tested at AutoZone.(Ok) I tried jumping the solinoid mounted to the header with the same results. Could a started have these symptons or should I be looking elsewhere ? All the nornall stuff like the oil has been checked.