Toyota 3VZ–FE Troubleshooting Manual page 508

SYSTEM CIRCUIT
OPERATION
When the ignition switch is turned ON, current from the battery flows from terminal L of the generator
through the IC regulator to terminal E, causing the discharge warning light to light up. Then when the engine
is started, the voltage output increases as the generator rpm increases. When the voltage output becomes
greater than the battery positive voltage, current for recharging flows from terminal B.
Simultaneously, 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
generator remains constant.
CHARGING SYSTEM – OPERATION
CH–3
CH00M–01
CH00P–01