9-S44
L3130 · L3430 · L3830 · L4630 · L5030, WSM
ELECTRICAL SYSTEM
[4] CHARGING SYSTEM
(1) Checking
Alternator
1. Disconnect the 2P connector (3) from alternator after turning the
main switch OFF.
2. Perform the following checkings.
W10181750
Connector Voltage
1. Turn the main switch OFF. Measure the voltage between the
terminal B (1) and the chassis.
2. Turn the main switch ON. Measure the voltage between the
terminal IG (3) and the chassis.
W10182790
No-Load Test
1. Connect the 2P connector (6) to previous positions of the
alternator after turning the main switch OFF.
2. Connect the jumper lead (3) between terminal IG (4) and terminal
B (2).
3. Start the engine and then set at idling speed.
4. Disconnect the negative cable from the battery.
5. Measure the voltage between the terminal B (2) and the chassis.
6. If the measurement is less than the factory specification,
disassemble the alternator and check the IC regulator.
(Reference)
• Once the engine has started, the alternator temperature rises
quickly up to an ambient temperature of 70 to 90 °C (158 to 194
°F). As the temperature goes higher than 50 °C (122 °F), the
alternator voltage slowly drops; at higher than 100 °C (212 °F), it
drops by about 1 V.
W10184780
(1) B Terminal
(2) Alternator
(3) 2P Connector
Voltage
(Main switch at OFF)
Terminal B – Chassis Approx. battery voltage
Voltage
(Main switch at ON)
Terminal IG – Chassis Approx. battery voltage
(1) Terminal B
(2) Alternator
(3) Terminal IG
(4) Terminal L
Voltage Factory spec. More than 14 V
(1) Voltmeter
(2) Terminal B
(3) Jumper Lead
(4) Terminal IG
(5) Terminal L
(6) 2P Connector
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