The generator provides the voltage to operate the vehicle's electrical system and to charge the battery through CKT 1 (RED). When the ignition switch is placed in the RUN position, voltage is supplied to generator terminal L by the PCM, turning on the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine starts, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This technique regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. The PCM monitors the field voltage on the generator F terminal.

The PCM turns on the charge indicator by sending a Class 2 message to the instrument cluster whenever undervoltage, overvoltage, or a stopped generator is detected by CKT 225 (RED).

Mounted on the battery is a battery thermistor. Power is provided from the DIM fuse through CKT 3340 (ORN) to terminal A of the battery thermistor. Terminal B of the thermistor is wired through CKT 725 (LT BLU) to the S terminal of the generator. The thermistor provides a temperature-compensated battery voltage to the regulator S terminal in the generator. This circuit allows the generator to adjust its output voltage according to the temperature.

The positive battery terminal is connected to the power input terminals of the rear junction block and the underhood junction block by two CKT 1 (BLK) cables. Power is supplied on CKT 1 (RED) from the underhood junction block input terminal to the starter solenoid BATT terminal. Another CKT 1 (RED) cable connects the solenoid BATT terminal to the generator BATT terminal. The negative battery terminal is connected to engine ground and chassis ground via two CKT 50 (BLK) ground cables.