ELECTRICAL SYSTEM
M6040, M7040, WSM
9-S19
[6] ALTERNATOR
Preparation
1. Disconnect the 2P connector (3) from alternator after turning the
main switch OFF.
2. Perform the following checkings.
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Connector Voltage
1. Turn off the main switch. Measure the voltage between the
terminal B (1) and the chassis.
2. Turn on the main switch. Measure the voltage between the
terminal IG (3) and the chassis.
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No-Load Test
1. Connect the 2P connector (6) to previous positions of the
alternator after turning off the main switch.
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 specifications,
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.
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(1) Terminal B
(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 specification 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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