if your car is and stock 1200 (original) and whit your test that you perform,than the alternator might be ok and the problem is the regulator or some fuse that power the regulator.
take care off this: you got one off the fuses thats power the regulator and them the alternator.there is no fuse to directy to the alternator.
a question: does the red light(batt or alternator) on the dash lights at all?
whem you turn the key to start the car or when is running ,the lights is on or bliking?
if doesnt ligth at all the regulator is f.... or is no power to the regulator.
pay atencion to the wires if are broken or dirty
or some rong conection.see if the warning red light on dashboar is blow.
this problem is not comum the this great machines .they are no electronics involved and the unique problems came on bad conections or dirt on the contacs on the plugs.
stay in contact
bye