it's a 2000 trailblazer and the THIRD starter just began sometimes not doing ANYTHING (solenoid closes but no current draw at all, all wiring is FINE) sometimes it grinds a bit, sometimes it spins fine but doesn't kick out. If you tap it with a hammer enough to get the starter to spin and kick out then it just locks the starter. The thing starts perfect, first pull with the rope but not at all with the starter AGAIN