Alternator - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

(19) Alternator

Alternator
1. Disconnect the 2P connector (3) from alternator after turning the
main switch OFF.
2. Perform the following checkings.
(1) Alternator
(2) B Terminal
Connector Voltage
1. Turn the main switch OFF. Measure the voltage between the B
terminal (1) and the chassis.
2. Turn the main switch ON. Measure the voltage between the IG
terminal (3) and the chassis.
Voltage (Main
B terminal – Chassis
switch at OFF)
Voltage (Main
IG terminal – Chassis
switch at ON)
(1) B Terminal
(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 IG terminal (4) and B
terminal (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 B terminal (2) and the
chassis.
6. If the measurement is less than the factory specification,
disassemble the alternator and check the IC regulator.
Voltage Factory specification
(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) B Terminal
(3) Jumper Lead
9-S32
ELECTRICAL SYSTEM
(3) 2P Connector
9Y1211109ELS0050US0
Approx. battery voltage
Approx. battery voltage
(3) IG Terminal
(4) L Terminal
9Y1211109ELS0051US0
More than 14 V
(4) IG Terminal
(5) L Terminal
(6) 2P Terminal
9Y1211109ELS0052US0
KiSC issued 11, 2014 A