When I try to start the car it wouldn't start. so I took the starter out and went and had it tested and the starter was fine it was getting power. so I put it back in and try to start it again and it still wouldn't start. but when I turn the key it sounds like the motor in the starter is coming on but not turning over to start the car. So I checked the battery connections there good and tight and the headlights or good and bright so its nothing to do with the battery. What else could it be?