hello,
thank you for your answer:
the alternator is not original, bought on ebay.
voltage at idle is more than 14V but I'll recheck.
I'll try the proxy alignment and you keep informed.
thank you.

hello, I speak french and i can not find anyone to help me in french forum ! my pb it's the battery indicator remains lit continuously on the dashboard for about 10 months: at this time my alternator dropped me (on alfa 159 1.9l 2007), I replaced it and the battery. I have FiatECUScan 3.6 interface ...