Charging System Indicator

The regulator controls the charging system indicator light and the charging signal (FR). Fuse 2 supplies battery voltage to the charging system indicator light. With the engine not running and the ignition switch in RUN, terminal L of the alternator is grounded by the voltage regulator and the charging system indicator light. With the engine running and the alternator charging, the voltage at terminal L rises and the charging system indicator light will go out. The rise in voltage at terminal L also provides an engine running/charging system functioning signal to the integrated control unit, the EPS control unit, and the ABS control unit. If the alternator fails to charge, terminal L will remain below battery voltage and the charging system indicator light will stay on.