What Cheetah is suggesting won't hurt anything. All that the PCM does is send 12 volts to the regulator basically telling it that the ignition has been turned on. Then there is a sensing voltage that is sent to the regulator usually through a fuse. All voltage/current regulation is handled internally within the alternator. Here'* a tyical description..taken from a '99 GP.
The generator provides voltage to operate the vehicle'* electrical system and to charge its battery. A magnetic field is created when current flows through the rotor. This field rotates as the rotor is driven by the engine, creating an AC voltage in the stator windings. The AC voltage is converted to DC by the rectifier bridge and is supplied to the electrical system at the battery terminal.
The generator'* digital regulator uses digital techniques to supply the rotor current and thereby control the output voltage. The rotor current is proportional to the width of the electrical pulses supplied by the digital regulator. When the ignition switch is on, voltage is supplied to terminal L from the powertrain control module (PCM) , turning on the digital regulator. Narrow width pulses are supplied to the digital rotor, creating a weak magnetic field. When the engine is started, the digital regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the digital regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation. Voltage is supplied at all times from the GEN fuse in the underhood accessory wiring junction block through circuit 2740 to terminal * of the generator. This is used to provide a better battery voltage measurement. The powertrain control module also monitors the generator using terminal F through circuit 23.
The monitoring done by the PCM is generally to indicate if a fault exists. About the only external thing that I can think of to check is the fuse, and connections that supply the sensing voltage to the regulator.
Black 2000 SSEi, Silverstar Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, drilled 180 degree thermostat, Intense FWI, PCM, shift kit, and 3.4 Pulley. Solid front mount.