I think that I will buy a new alternator. I change it by myself. Do you know what kind of the alternator must be? I would buy correct alternator.
Clearly a faulty alternator. Not sure on the 120 but Nippon Denso was the make that most decent Japanese cars had from new. There should be a number and manufacturer on it somewhere.The batteries are new. I have charged them by ctek. I can drive some days without charging. Voltage after start is 12.5 V and 2000 rpm little more than 13 V. ( The voltage is not normal I said incorrectly).