Quite frequently when I try to start the car there is a hesitation from the starter...like there is a build up then it finally catches and the car starts. I did find one source of the problem that being the cable from the solenoid at the starter was loose. I tightened that up and thought I had the problem solved. Still had the problem occasionally. Then I discovered that the positive battery post ,made out of that soft metal ,was just about split in half probably from over tightening. Replaced the post but still experience the same issue now and again. The battery has 12 volts and the alternator is charging it. Is it possible the starter itself is the problem? Is there a test I can do on it?