is the regulator on the PCm accessible? When it goes...just rip it out or bypass it and go with a REAL alternator!?
Regulators usually need a few volts more than what they are regulating to. (12V regulator needs 14-15volts input). So, if you want to hack your 'real' alt and put in a higher regulator, then the computers' regulator would still regulate and it should still work!