I still think that if you can return that alternator you bought and get your original one back (assuming you turned it in for the core), run the FSM tests on the Voltage Regulator, and if it fails, replace the regulator and see if that solves your problem...alot cheaper since you would only be replacing the regulator and not the whole alternator set-up...
...but you never posted the results of that test, so I'm assuming you didn't run it...
...but you never posted the results of that test, so I'm assuming you didn't run it...