Charging System; Checking - wsm L503 Workshop Manual

L3130 · L3430 · L3830 · L4630 · L5030, WSM

[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.
(1) B Terminal
(2) Alternator
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.
Voltage
Terminal B – Chassis
(Main switch at OFF)
Voltage
Terminal IG – Chassis
(Main switch at ON)
(1) Terminal B
(2) Alternator
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.
Voltage Factory spec.
(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.
(1) Voltmeter
(2) Terminal B
(3) Jumper Lead
9-S44
ELECTRICAL SYSTEM
(3) 2P Connector
W10181750
Approx. battery voltage
Approx. battery voltage
(3) Terminal IG
(4) Terminal L
W10182790
More than 14 V
(4) Terminal IG
(5) Terminal L
(6) 2P Connector
W10184780
KiSC issued 02, 2007 A