Montero Sport 2WD V6-3.0L SOHC (1997)
Voltage Regulator: Testing and Inspection
Regulated Voltage Test
Voltage Regulation Table
This test determines if the voltage regulator is correctly controlling the generator output voltage.
1. Be sure to check the following:
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Generator installation and wiring connections.
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Battery fully charged. See: Battery/Description and Operation
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Generator drive belt tension.
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Fusible link.
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Abnormal noise from the generator while the engine is running
2. Turn the ignition switch to the OFF position.
3. Disconnect the negative battery cable.
4. Connect a digital-type voltmeter between the generator "S" terminal and the ground. (Connect the (+) lead of the voltmeter to the "S" terminal.
Connect the (-) lead of the voltmeter to a secure ground or to the battery (-) terminal.)
5. Disconnect the generator output wire from the generator "B" terminal.
6. Connect a DC test ammeter with a range of 0 - 100 A in series between the "B" terminal and the disconnected output wire. (Connect the (+) lead
of the ammeter to the "B" terminal. Connect the (-) lead of the ammeter to the disconnected output wire.)
7. Reconnect the negative battery cable.
8. Connect a tachometer or scantool.
9. Turn the ignition switch to the ON position and check that the reading on the voltmeter is equal to the battery voltage.
NOTE: If the voltage is 0 V, the cause is probably an open circuit in the wire or fusible link between the generator "S" terminal and the battery (+)
terminal.
10. Check to be sure all lights and accessories are OFF.
11. Start the engine.
12. Increase the engine speed to Approx. 2,500 rpm.
13. Read the voltmeter when the current output by the generator becomes 10 A or less.
14. If the voltage reading conforms to the value in the voltage regulation table the voltage regulator is operating normally.
If the voltage is outside the standard value, there is a malfunction of the voltage regulator or of the generator.
15. After the test, lower the engine speed to the idle speed.
