Alternator: Description and Operation

The alternator is a small, high RPM, high performance type with an IC regulator incorporated. The IC regulator uses integrated circuits which control the voltage produced by the alternator.
With the ignition switch in the On position, current flows from terminal L of the alternator through the IC regulator to terminal E, causing the discharge warning light to light up, Fig. 1 through 3. When the engine is started, voltage output increases as engine RPM increases. When the voltage output becomes greater than battery voltage, current for recharging flows from terminal B. At the same time, voltage at terminal L increases and the potential difference between battery (+) and terminal L disappears, causing the discharge warning light to go off. When the voltage output exceeds the regulator adjustment voltage, the transistor inside the IC regulator regulates the voltage so that the voltage from the alternator remains constant.

Fig. 1 Alternator Charging System:

Fig. 2 Alternator Charging System:

Fig. 3 Alternator Charging System: