Toyota Tundra. Manual — part 1074

1. Disconnect the wire from terminal B of the generator, then connect it to the negative (-) lead

of an ammeter.

2. Connect the positive (+) lead of the ammeter to terminal B of the generator.

3. Connect the positive (+) lead of a voltmeter to the positive (+) terminal of the battery.

4. Ground the negative (-) lead of the voltmeter.

Fig. 7: Inspecting Charging Circuit Without Load
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Check the charging circuit.

1. Keep the engine speed at 2000 rpm and check the reading on the ammeter and voltmeter.

Standard current: 10 A or less

Standard voltage: 13.2 to 14.8 V

If the voltmeter reading is more than the standard voltage, replace the voltage regulator.

HINT:

If the battery is not fully charged, the ammeter reading will sometimes be more than the
standard amperage.

8. INSPECT CHARGING CIRCUIT WITH LOAD

a. With the engine running at 2000 rpm, turn the high beam headlights ON and turn the heater blower

switch to the "HI" position.

b. Check the reading on the ammeter.

Standard current: 30 A or more

If the ammeter reading is less than the standard amperage, repair the generator.

2009 Toyota Tundra

2009 ELECTRICAL Charging (1GR-FE) - Tundra

HINT:

If the battery is fully charged, the indication will sometimes be less than the standard amperage. If
this is the case, add more electrical load (operate the wipers, rear window defogger, etc.) and check
the reading on the ammeter again.

GENERATOR

COMPONENTS

2009 Toyota Tundra

2009 ELECTRICAL Charging (1GR-FE) - Tundra

Fig. 8: Identifying Generator Components And Torque Specifications (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 9: Identifying Generator Components And Torque Specifications (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

REMOVAL

2009 Toyota Tundra

2009 ELECTRICAL Charging (1GR-FE) - Tundra

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

2. REMOVE BATTERY

3. REMOVE V-BANK COVER (See REMOVAL )

4. REMOVE NO. 1 ENGINE UNDER COVER SUB-ASSEMBLY (See REMOVAL )

5. REMOVE FAN AND GENERATOR V BELT (See REMOVAL )

6. REMOVE GENERATOR ASSEMBLY

a. Remove the nut and disconnect the wire harness clamp bracket.

Fig. 10: Identifying Wire Harness Clamp Bracket Nut
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the generator connector.

c. Remove the terminal cap.

d. Remove the nut and disconnect the generator wire.

e. Remove the wire harness clamp.

f. Remove the bolt and disconnect the wire harness clamp bracket.

NOTE:



Some systems need to be initialized after the cable is reconnected
(see INITIALIZATION ).



After the ignition switch is turned OFF, the navigation system
requires approximately 90 seconds to record various types of
memory and settings. As a result, after turning the ignition switch
OFF, wait 90 seconds or more before disconnecting the cable from
the negative (-) battery terminal.

2009 Toyota Tundra

2009 ELECTRICAL Charging (1GR-FE) - Tundra