The document provides instructions for inspecting and testing a vehicle's charging system. It describes how to check the battery, drive belt, generator wiring, and charging circuit both with and without load. The generator inspection section explains how to test the stator, rotor, brushes, and rectifiers for issues. Detailed steps are given for disassembling and inspecting individual generator components.

1. CHARGING SYSTEM
CH-1

2. PRECAUTION
1. Check that the battery cables are connected to the correct terminals.
2. Disconnect the battery cables when the battery is given a quick charge.
3. Do not perform tests with a high voltage insulation resistance tester.
4. Never disconnect the battery while the engine is running.
SYSTEM CIRCUIT
-CHARGING SYSTEM PRECAUTION
CH-2

3. PRECAUTION
1. Check that the battery cables are connected to the correct terminals.
2. Disconnect the battery cables when the battery is given a quick charge.
3. Do not perform tests with a high voltage insulation resistance tester.
4. Never disconnect the battery while the engine is running.
SYSTEM CIRCUIT
-CHARGING SYSTEM SYSTEM CIRCUIT
CH-2

4. PREPARATION
SST (SPECIAL SERVICE TOOLS)
Rotor front bearing
09285-76010 Injection Pump Camshaft Bearing
Cone Replacer
(09608-00030) Replacer
09608-20012 Front Hub & Drive Pinion Bearing
Tool Set
09820-63010 Alternator Pulley Set Nut Wrench
Set
09286-4601 1 Injection Pump Spline Shaft
Puller
09820-00030 Alternator Rear Bearing Replacer
RECOMMENDED TOOLS
09820-00021 Alternator Rear Bearing Puller
09082-00050 TOYOTA Electrical Tester Set
Battery specific gravity gauge
09200-00010 Engine Adjust Kit
Belt tension gauge
09905-00013 Snap Ring Pliers
EQUIPMENT
Rotor rear bearing cover
Rotor (Slip ring), BrushVernier calipers
Torque wrench
Rectifier end frame
Rotor rear bearing
Generator washer
-CHARGING SYSTEM PREPARATION
CH-3

5. 2. CHECK BATTERY TERMINALS, FUSIBLE LINK AND
FUSES
(a) Check that the battery terminals are not loose or
corroded.
If the terminals are corroded, clean the terminals.
(b) Check the fusible link and fuses for continuity.
Fusible link:
MAIN 2.0L
H-fuse:
ALT 100A
AM1 50A
Fuse:
AM2 15A
GAUGE 15A
IGN 7.5A
ALT-S 7.5A
ON-VEHICLE INSPECTION
1. CHECK BATTERY SPECIFIC GRAVITY AND
ELECTROLYTE LEVEL
(a) Check the electrolyte quantity of each cell.
If insufficient, refill with distilled (or purified) water.
(b) Check the specific gravity of each cell.
Standard specific gravity:
1.25 - 1.27 at 20°C (68°F)
If the specific gravity is less than specifications,
charge the battery.
HINT: Check the indicator as shown in the illustration.
3. INSPECT DRIVE BELT
(a) Visually check the drive belt for excessive wear,
frayed cords etc.
If any defect is found, replace the drive bolt.
HINT: Cracks on the rib side of a drive belt are consid-
ered acceptable. If the drive belt has chunks missing
from the ribs, it should be replaced.
-CHARGING SYSTEM ON-VEHICLE INSPECTION
CH-4

6. (b) Using a belt tension gauge, check the drive belt ten-
sion.
Belt tension gauge:
Nippondenso BTG-20 (95506-00020)
Borroughs No. BT-33-73F
Drive belt tension:
New belt
160 ± 20 lbf
Used belt
100 ± 20 lbf
If necessary, adjust the drive belt tension.
HINT:
• ”New belt” refers to a belt which has been used
less than 5 minutes on a running engine.
• ”Used belt” refers to a belt which has been used
on a running engine for 5 minutes or more.
• After installing a belt, check that it fits properly in
the ribbed grooved.
• Check by hand to confirm that the belt has not
slipped out of the groove on the bottom of the
pulley.
• After installing a new belt, run the engine for
about 5 minutes and recheck the belt tension.
4. VISUALLY CHECK GENERATOR WIRING AND
LISTEN FOR ABNORMAL NOISES
(a) Check that the wiring is in good condition.
(b) Check that there is no abnormal noise from the gener-
ator while the engine is running.
-CHARGING SYSTEM ON-VEHICLE INSPECTION
CH-5

7. 6. INSPECT CHARGING CIRCUIT WITHOUT LOAD
HINT: If a battery/generator tester is available, con-
nect the tester to the charging circuit as per
manufacturer’s instructions.
(a) If a tester is not available, connect a voltmeter and
ammeter to the charging circuit as follows:
• Disconnect the wire from terminal B of the gener-
ator and connect it to the negative (-) tester
probe of the ammeter.
• Connect the positive (+) tester probe of the am-
meter to terminal B of the generator.
• Connect the positive (+) tester probe of the
voltmeter to terminal B of the generator.
• Ground the negative (-) tester probe of the volt-
meter.
(b) Check the charging circuit as follows:
With the engine running from idling to 2,000 rpm,
check the reading on the ammeter and voltmeter.
Standard amperage:
10 A or less
Standard voltage:
13.9 - 15.1 V at 25°C (77°F)
13.5 - 14.3 V at 115° C (239° F)
If the voltmeter reading is greater than standard volt-
age, replace the voltage regulator.
If the voltmeter reading is less than standard voltage,
check the voltage regulator and generator as follows:
• With terminal F grounded, start the engine and
check the voltmeter reading of terminal B.
5. INSPECT CHARGE WARNING LIGHT CIRCUIT
(a) Warm up the engine and then turn it off.
(b) Turn off all accessories.
(c) Turn the ignition switch ’ON’. Check that the charge
warning light is lit.
(d) Start the engine. Check that the light goes off.
If the light does not go off as specified, troubleshoot
the charge light circuit.
-CHARGING SYSTEM ON-VEHICLE INSPECTION
CH-6

8. 7. INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the
high beam headlights and place the heater blower
switch at ’Hl”.
(b) Check the reading on the ammeter.
Standard amperage:
30 A or more
• If the voltmeter reading is greater than standard
voltage, replace the voltage regulator.
• If the voltmeter reading is less than standard
voltage, check the generator.
If the ammeter reading is less than the standard am-
perage, repair the generator.
HINT: If the battery is fully charged, the indication will
sometimes be less than standard amperage.
-CHARGING SYSTEM ON-VEHICLE INSPECTION
CH-7

9. GENERATOR
GENERATOR REMOVAL
1. DISCONNECT NEGATIVE TERMINAL CABLE FROM
BATTERY
CAUTION (w/ SRS): Work must be started after 90 sec-
onds from the time the ignition switch is turned to the ”
LOCK” position and the negative (-) terminal cable is
disconnected from the battery.
2. DISCONNECT CONNECTOR AND WIRE FROM
GENERATOR
(a) Disconnect the connector from the generator.
(b) Remove the connector cover and nut, and disconnect
the wire from the generator.
3. REMOVE DRIVE BELT
Loosen the pivot bolt and adjusting bolt, and remove
the drive belt.
4. REMOVE GENERATOR
(a) Remove the pivot bolt, nut and adjusting bolt.
(b) Remove the generator.
-CHARGING SYSTEM GENERATOR
CH-8

10. GENERATOR DISASSEMBLY
(See Components for Disassembly and Assembly)
1. w/ Dust Cover:
REMOVE DUST COVER
Remove the 3 bolts and dust cover.
COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY
2. REMOVE REAR END COVER
(a) Remove the nut and terminal insulator.
-CHARGING SYSTEM GENERATOR
CH-9

11. 3. REMOVE BRUSH HOLDER AND VOLTAGE
REGULATOR
(a) Remove the 5 screws, brush holder and voltage regu-
lator.
4. REMOVE RECTIFIER HOLDER
(a) Remove the 4 screws and rectifier holder.
(b) Remove the brush holder cover from the brush holder.
(b) Remove the 4 rubber insulators.
(b) Remove the 3 nuts and end cover.
-CHARGING SYSTEM GENERATOR
CH-10

12. 5. REMOVE PULLEY
(a) Hold SST (A) with a torque wrench, and tighten SST (B)
clockwise to the specified torque.
SST 09820-63010
Torque: 39 N-m (400 kgf-cm, 29 ft-lbf)
(b) Check that SST (A) is secured to the rotor shaft.
(e) To loosen the pulley nut, turn SST (A) in the direction
shown in the illustration.
NOTICE: To prevent damage to the rotor shaft, do not
loosen the pulley nut more than one-half of a turn.
(f) Remove the generator from SST (C).
(c) Mount SST (C) in a vise.
(d) Insert SST (B) into SST (C), and attach the pulley nut to
SST (C).
(g) Turn SST (B), and remove SST (A and B).
(h) Remove the pulley nut and pulley.
-CHARGING SYSTEM GENERATOR
CH-1 1

13. (c) Using snap ring pliers, remove the generator washer
from the rectifier end frame.
(b) Using SST, remove the rectifier end frame.
SST 09286-46011
6. REMOVE RECTIFIER END FRAME
(a) Remove the 4 nuts.
7. REMOVE ROTOR FROM DRIVE END FRAME
-CHARGING SYSTEM GENERATOR
CH-12

14. Stator (Drive End Frame)
1. INSPECT STATOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity
between the coil leads.
If there is no continuity, replace the drive end frame
assembly.
2. INSPECT STATOR FOR GROUND
Using an ohmmeter, check that there is no continuity
between the coil lead and drive end frame.
If there is continuity, replace the drive end frame
assembly.
3. INSPECT SLIP RINGS
(a) Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor.
(b) Using a vernier caliper, measure the slip ring diameter.
Standard diameter:
14.2 - 14.4 mm (0.558 - 0.567 in.)
Minimum diameter:
12.8 mm (0.504 in.)
If the diameter is less than minimum, replace the rotor.
GENERATOR INSPECTION AND REPAIR
Rotor
1. INSPECT ROTOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity
between the slip rings.
Standard resistance:
2.8 - 3.0W at 20°C (68°F)
If there is no continuity, replace the rotor.
2. INSPECT ROTOR FOR GROUND
Using an ohmmeter, check that there is no continuity
between the slip ring and rotor.
If there is continuity, replace the rotor.
-CHARGING SYSTEM GENERATOR
CH-13

15. Brushes
1. INSPECT EXPOSED BRUSH LENGTH
Using a scale, measure the exposed brush length.
Standard exposed length:
10.5 mm (0.413 in.)
Minimum exposed length:
1.5 mm (0.059 in.)
If the exposed length is less than minimum, replace
the brushes.
2. IF NECESSARY, REPLACE BRUSHES
(a) Unsolder and remove the brush and spring.
(b) Run the wire of a new brush through the spring and
the hole in the brush holder, and insert the spring and
brush into the brush holder.
Rectifiers (Rectifier Holder)
1. INSPECT POSITIVE RECTIFIER
(a) Using an ohmmeter, connect one tester probe to the
positive (+) terminal and the other to each rectifier
terminal.
(b) Reverse the polarity of the tester probes and repeal
step (a).
(c) Check that one shows continuity and the other show:
no continuity.
If continuity is not as specified, replace the rectifier
holder.
(c) Solder the brush wire to the brush holder at specified
exposed length.
Exposed length:
10.5 mm (0.413 in.)
(d) Check that the brush moves smoothly in the brush
holder.
(e) Cut off the excess wire.
(f) Apply insulation paint to the soldered area.
-CHARGING SYSTEM GENERATOR
CH-14

16. 2. INSPECT NEGATIVE RECTIFIER
(a) Using an ohmmeter, connect one tester probe to each
negative (-) terminal and the other to each rectifier
terminal.
(b) Reverse the polarity of the tester probes and repeat
step (a).
(c) Check that one shows continuity and the other shows
no continuity.
If continuity is not as specified, replace the rectifier
holder.
Bearings
1. INSPECT FRONT BEARING
Check that the bearing is not rough or worn.
(b) Using a socket wrench and press, press out the bear-
ing.
2. IF NECESSARY, REPLACE FRONT BEARING
(a) Remove the 4 screws, bearing retainer and bearing.
(c) Using SST and a press, press in a new bearing.
SST 09608-20012 (09608-00030)
-CHARGING SYSTEM GENERATOR
CH-15

17. 4. IF NECESSARY, REPLACE REAR BEARING
(a) Using SST, remove the bearing cover (outside) and
bearing.
SST 09820-00021
NOTICE: Be careful not to damage the fan.
(b) Remove the bearing cover (inside).
(d) Using SST and a press, press in a new bearing.
SST 09820-00030
(d) Install the bearing retainer with the 4 screws.
Torque: 2.6 N-m (27 kgf-cm, 23 in.-lbf)
3. INSPECT REAR BEARING
Check that the bearing is not rough or worn.
(c) Place the bearing cover (inside) on the rotor.
-CHARGING SYSTEM GENERATOR
CH-16

18. 3. INSTALL RECTIFIER END FRAME
(a) Install the generator washer to the rectifier end frame.
NOTICE: Be careful of the generator washer installation
direction.
GENERATOR ASSEMBLY
(See Components for Disassembly and Assembly)
1. PLACE RECTIFIER END FRAME ON PULLEY
(b) Using a 29 mm socket wrench and press, slowly press
in the rectifier end frame.
(e) Using SST, push in the bearing cover (outside).
SST 09285-76010
2. INSTALL ROTOR TO DRIVE END FRAME
-CHARGING SYSTEM GENERATOR
CH-17

19. (b) Hold SST (A) with a torque wrench, and tighten SST (B)
clockwise to the specified torque.
SST 09820-63010
Torque: 39 N-m (400 kgf-cm, 29 ft-lbf)
(c) Check that SST (A) is secured to the pulley shaft.
(f) To torque the pulley nut, turn SST (A) in the direction
shown in the illustration.
Torque: 110 N-m (1,125 kgf-cm. 81 ft-lbf)
(g) Remove the generator from SST (C).
(d) Mount SST (C) in a vise.
(e) Insert SST (B) into SST (C), and attach the pulley nut to
SST (C).
4. INSTALL PULLEY
(a) Install the pulley to the rotor shaft by tightening the
pulley nut by hand.
(d) install the 4 nuts.
Torque: 4.5 N-m (46 kgf-cm, 40 in.-lbf)
-CHARGING SYSTEM GENERATOR
CH-18

20. 6. INSTALL VOLTAGE REGULATOR AND BRUSH
HOLDER
(a) Install the brush holder cover to the brush holder.
NOTICE: Be careful of the holder installation direction.
5. INSTALL RECTIFIER HOLDER
(a) Install the 4 rubber insulators on the lead wires.
NOTICE: Be careful of the rubber insulators installation
direction.
(b) Install the rectifier holder while pushing it with the 4
screws.
Torque: 3.06 N-m (31 kgf-cm, 27 in.-lbf)
(b) Place the voltage regulator together with the brush
holder horizontally on the rectifier end frame.
(h) Turn SST (B), and remove SST (A and B).
-CHARGING SYSTEM GENERATOR
CH-19

21. (c) Install the 5 screws until there is a clearance of
approx. 1 mm (0.04 in.) between the brush holder and
voltage regulator.
Torque: 2.04 N-m (21 kgf-cm, 18 in.-lbf)
8. w/ Dust Cover:
INSTALL DUST COVER
Install the dust cover with the 3 bolts.
Torque: 5.4 N-m (55 kgf-cm, 48 in.-lbf)
7. INSTALL REAR END COVER
(a) Install the end cover with the 3 nuts.
Torque: 4.5 N-m (46 kgf-cm, 40 in.-lbf)
(b) Install the terminal insulator with the nut.
Torque: 4.1 N-m (42 kgf-cm, 36 in.-lbf)
(d) Fit the brush holder cover.
-CHARGING SYSTEM GENERATOR
CH-20

22. GENERATOR INSTALLATION
1. INSTALL GENERATOR
Mount the generator on the generator bracket with
the pivot bolt, nut and adjusting bolt. Do not tighten
the bolts yet.
2. INSTALL DRIVE BELT
(a) Adjust the drive belt tension. (See page CH-5 )
(b) Tighten the pivot bolt and adjusting bolt.
Torque:
41 N-m (420 kgf-cm, 30 ft-lbf) for pivot bolt
12 N-m (120 kgf-cm, 9 ft-lbf) for adjusting bolt
4. CONNECT NEGATIVE TERMINAL CABLE TO
BATTERY
5. PERFORM ON-VEHICLE INSPECTION
(See steps 5 to 7 on pages CH-6 and CH-7 )
3. CONNECT CONNECTOR AND WIRE TO
GENERATOR
9. CHECK THAT ROTOR ROTATES SMOOTHLY
-CHARGING SYSTEM GENERATOR
CH-21

23. 12V 60 A, 12V 70A
2.8 - 3.0 W
14.2 - 14.4 mm (0.559 - 0.567 in.)
12.8 mm (0.504 in.)
10.5 mm (0.413 in.)
1.5 mm (0.059 in.)
SERVICE SPECIFICATIONS
SERVICE DATA
Rated output
Rotor coil resistance
Slip ring diameter
Brush exposed length
TORQUE SPECIFICATIONS
Rectifier holder x Coil lead on rectifier end frame
Voltage regulator x Rectifier end frame
Rectifier end frame x Drive end frame
Bearing retainer x Drive end frame
Terminal insulator x Rectifier holder
at 25°C (77°F)
at 115°C (239° F)
Brush holder x Rectifier end frame
Rear end cover x Rectifier holder
Dust cover x Rectifier end frame
Generator x Generator bracket
Generator x Adjusting lever
Dust cover x Drive end frame
13.9 - 15.1 V
13.5 - 14.3 V
Generator pulley x Rotor
160 ± 20 Ibf
100 ± 20 lbf
STD
Limit
STD
Limit
Voltage
regulator
Regulating voltage
New belt
Used belt
Specific gravity at 20°C (68°F)
Part tightened
1.25 - 1.27
Drive belt
Generator
40 in.-lbf
48 in.-lbf
48 in.-lbf
40 in.-lbf
36 in.-lbf
18 in.-lbf
18 in.-lbf
23 in.-lbf
27 in.-lbf
Tension
Battery
kgf-cm
1,125
ft lbf
2.04
2.04
3.06
420
110
120
5.4
5.4
2.6
4.5
4.5
-CHARGING SYSTEM SERVICE SPECIFICATIONS
CH-22