I have only bought this one. So i can not say if there have very often a fault. But the quality is not very good. A modern Alternator is able to run without a Batterie connection. But worse build Alternaters can have the Problem if you run them without a Batterie then the will demage. I have rebuild the Traktor and the Motor was running without a Batterie so i have no idea if the alternator was broken from the beginning or after a start without a Batterie. In bothe situation it is a warrenty case and i have bought a better quality without any Problems. hope it helps

Hi i have the same problem. I dont think its any fault on the altinator. Have you cheked the D+ on the altinator, it should go to an ”idiot lamp” that starts the altinator. If the lamp is broken, the altinator wont start, even if its spinning!

it is solved, with a new alternator.