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System DescriptionNLSC0009The alternator provides DC voltage to operate the vehicle’s electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to alternator terminal 4 (S) through:
+10A fuse (No. 33, located in the fuse and fusible link box).
Terminal B supplies power to charge the battery and operate the vehicle’s electrical system. Output voltage
is controlled by the IC regulator at terminal 4 (S) detecting the input voltage. The charging circuit is protected
by the 80A (QG engine models except for Northen Europe and cold spec.) or 100A (SR, YD engine models
and QG engine models for Northen Europe and cold spec.) fusible link.
The alternator is grounded to the engine block.
With the ignition switch in the ON or START position, power is supplied
+through 10A fuse [No. 30, located in the fuse block (J/B)]
+to combination meter terminal 9
Ground is supplied to terminal 22 of the combination meter through terminal 3 (L) of the alternator. With power
and ground supplied, the charge warning lamp will illuminate. When the alternator is providing sufficient volt-
age with the engine running, the ground is opened and the charge warning lamp will go off.
If the charge warning lamp illuminates with the engine running, a fault is indicated.
CHARGING SYSTEM
System Description
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Wiring Diagram—CHARGE—NLSC0010MODELS WITH FUSE AND FUSIBLE LINK BOX E43NLSC0010S04
YEL858B
CHARGING SYSTEM
Wiring Diagram—CHARGE—
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MODELS WITH FUSE AND FUSIBLE LINK BOX E90NLSC0010S05
YEL388C
CHARGING SYSTEM
Wiring Diagram—CHARGE—(Cont’d)
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Trouble DiagnosesNLSC0011Before conducting an alternator test, make sure that the battery is fully charged. A 30-volt voltmeter and suit-
able test probes are necessary for the test. The alternator can be checked easily by referring to the Inspec-
tion Table.
+Before starting, inspect the fusible link.
+Use fully charged battery.
WITH IC REGULATORNLSC0011S01
SEL338V
NOTE:
+If the inspection result is OK even though the charging system is malfunctioning, check the B terminal
connection. (Check the tightening torque.)
+When field circuit is open, check condition of rotor coil, rotor slip ring and brush. If necessary, replace faulty
parts with new ones.
MALFUNCTION INDICATORNLSC0011S02The IC regulator warning function activates to illuminate“CHARGE”warning lamp, if any of the following
symptoms occur while alternator is operating:
+Excessive voltage is produced.
+No voltage is produced.
CHARGING SYSTEM
Trouble Diagnoses
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ConstructionNLSC0012
MEL141LA
MEL497L
CHARGING SYSTEM
Construction
SC-28
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NEL733
YEL427B
CHARGING SYSTEM
Construction (Cont’d)
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NEL732
Removal and InstallationNLSC0013REMOVAL (SR ENGINE)NLSC0013S041. Disconnect alternator connector, the terminal and A/C com-
pressor.
2. Loosen alternator upper (lock) bolt and the adjusting bolt.
3. Remove engine under cover RH.
4. Remove A/C compressor bolts×4.
5. Remove alternator mounting bracket bolt×1 and the nuts×2.
6. Loosen alternator lower bolt (long bolt).
7. Remove alternator upper bolt.
8. Move alternator towerd vehicle front.
9. Remove alternator mounting bracket bolt×1.
10. Remove alternator with mounting bracket.
MEL145L
REMOVAL (QG ENGINE)NLSC0013S011. Loosen drive belt idler pulley.
2. Remove drive belt idler pulley (include tightening screw).
3. Remove alternator harness.
4. Remove alternator upper bolt and lower bolt.
5. Remove alternator.
NEL645
REMOVAL (YD ENGINE)NLSC0013S031. Remove alternator harness.
2. Loosen alternator upper nut and lower bolt.
3. Loosen drive belt.
4. Remove alternator bracket bolts (two).
5. Remove alternator upper nut and lower bolt.
6. Remove alternator.
INSTALLATIONNLSC0013S02To install, reverse the removal procedure.
CHARGING SYSTEM
Removal and Installation
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SEL032Z
DisassemblyNLSC0021REAR COVERNLSC0021S01CAUTION:
Rear cover may be hard to remove because a ring is used to
lock outer race of rear bearing. To facilitate removal of rear
cover, heat just bearing box section with a 200W soldering
iron.
Do not use a heat gun, as it can damage diode assembly.
REAR BEARINGNLSC0021S02CAUTION:
+Do not reuse rear bearing after removal. Replace with a
new one.
+Do not lubricate rear bearing outer race.
SEL033Z
InspectionNLSC0022ROTOR CHECKNLSC0022S011. Resistance test
Resistance: Refer to SDS (SC-34).
+Not within the specified values ... Replace rotor.
2. Insulator test
+Continuity exists ... Replace rotor.
3. Check slip ring for wear.
Slip ring minimum outer diameter:
Refer to SDS (SC-34).
+Not within the specified values ... Replace rotor.
CHARGING SYSTEM
Disassembly
SC-31