Wiring Connections

In addition to the ground path through the generator housing and engine, the generator uses 3 wiring connections:
^ The output terminal connects to battery positive, and is hot at all times.
^ Generator terminal L is connected to the PCM. The connection is through harness terminal B in the 4-way generator connector.
If the built-in regulator detects a charging system fault, the regulator grounds this circuit. Grounding the circuit signals the PCM to light the charge indicator in the instrument cluster.
^ Generator terminal F is connected internally to the generator field. Terminal F is also connected to the PCM through harness terminal C in the 4-way generator connector.

The PCM monitors this circuit for fault detection. Monitoring lasts from the time the engine is turned ON until the engine starts. As long as the duty cycle signal in this circuit indicates that the generator is not operating, the PCM lights the charge indicator.

When the duty cycle first indicates that the generator is operating, the PCM turns OFF the charge indicator. The PCM then switches taut detection monitoring to the L circuit.