The cause of the fault with these starters is worn contacts and a worn plunger assembly within the solenoid housing. The wear to the brush gear, armature, drive gear and bearings is nominal and these components rarely fail, the starter motor is a very robust unit save for the solenoid contact and plunger which cause the faults. During its service life these copper contacts are spark eroded and wear away to the point that the electrical contact is lost causing the starter motor to no longer fire / function. It is a very straight forward job to replace these components with our new parts to restore the starter motor to full health, with no difference in cranking power in comparison to a brand new unit. It is extremely rare that the unit cannot be overhauled to restore function.