I removed the alternator , replaced the voltage regulator and the laminated core.
Started the car and the flickering is still there. I think I just wasted some money and I should replace the rectifier now , if i'm not mistaken !!!!
, I'm an electrician I know the rectifier has diodes and I didn't have a multimeter to check it , took it to a car electrician and after a while he told me it's fine. It doesn't need to be replaced !!
This is a pic of a rectifier , but it's for another car (just to show how it looks) it's almost the same.