OK sorry, somehow I got your symptom confused... Only one I've seen with a continual light when the alt was charging was a 2G Ford that use internal regulator, in that case it was a bad regulator...
yeap...almost sure the regulator I installed is designed for generators (2 terminals) and not for alternators... I need to go back to a normal 4 terminals regulator like the original... I hope this will make the light turn off!! thanks dear friend.