Not always, when the car starts to strike, it's the starter. This can partly also be a defective alternator. The advantage of the old alternators is, that they can be worked up in most cases. In this example, the pulley running surfaces for wear and impact points are checked, fan wheels tested for impact marks and concentricity, checked bearings and replaced if necessary.
With the runner a test is performed and looked whether overtightening of slip ring is present and if necessary replaced at minimal undershoot. Also a functional test of the electronic field controller is performed, including the carbon brushes replacement part at minimum underflow short to ground. For the hobbyist this is much effort and you also have to pay attention to a few important things. Apart from the complete disassembly of the individual components our service also includes a professional surface treatment. That why you should give your alternator in good hands and our regeneration service.