The solenoid in my starter is on the fritz. It's acted up in the past but rarely. Recently though on our last trip to big sur twice it refused to engage until I crawled under the rig and rapped on the starter with a heavy tool. Guess it loosened up the solenoid. The symptoms are that there is just a click but the starter does not spin up. But after giving the starter a couple of hard knocks it will spin up. Anyone else have or had this problem. I do know someone else that has had the problem. Maybe the solenoid is serviceable?? I am not going to service it, just replace it but might consider keeping it as a spare instead of turning it back in for the core charge.