I have a mid 70s winnebago on a Dodge cb300 chassis. It has a 360ci engine. The engine is turning over slowly. The battery is new and resting voltage is around 12.8v. when cranking voltage drops to 11+v volts and quickly recovers to 12.5v when stopping cranking. I checked the amp draw of the starter with my amp clamp and it's drawing 375-400+ amps when cranking over slowly. That number seems awfully high to me. Does it sound like my starter is bad?