Nacho,
That is what I am afraid of (that OEM rebuild parts won't work for the high-output alternator).
I just replaced some fuel fittings so I had to run the car for a while to check for leaks. Guess, what? Alternator is now charging. Cold the alternator was at 14.5V down to 13.8V when the car was good and hot. Under a big load (AC on, max blower speed), the alternator was holding at 13.1V at around 900 RPM (out of gear idle).
The diodes can be heat sensitive: You tests do not look encouraging IE:
Cold the alternator was at 14.5V down to 13.8V when the car was good and hot.
and
Under a big load (AC on, max blower speed), the alternator was holding at 13.1V at around 900 RPM (out of gear idle).
I would repeat the last test (load) with the RPM up to 2-2.5K and see what the readings are.
