RESULT
If it reads 0V, there is an open circuit in the wire between the generator "B" terminal and the battery (-), or the fusible link is
blown.
2. Start the engine. Keep all lights and accessories off.
3. Run the engine at a speed of about 2,500 rpm and read the voltmeter when the generator output current drops to 10A or
less.
1. If the voltmeter reading agrees with the value listed in the Regulating Voltage Table below, the voltage regulator is
functioning correctly. If the reading is other than the standard value, the voltage regulator or the generator is faulty.
Regulating Voltage Table
Voltage regulator ambient temperature °C (°F)
Regul ating voltage (V)
-20 (-4)
20 (68)
60 (140)
80 (176)
14.2 ~ 15.4
14.0 ~ 15.0
13.7 ~ 14.9
13.5 ~ 14.7
2. Upon completion of the test, reduce the engine speed to idle, and turn off the ignition switch.
3. Disconnect the battery ground cable.
4. Remove the voltmeter and ammeter and the engine tachometer.
5. Connect the generator output wire to the generator "B" terminal.
6. Connect the battery ground cable.
1. Be sure to check the following before testing:
Generator installation and wiring connections
Generator drive belt tension
Fusible link
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. Disconnect the generator output wire from the generator "B" terminal. Connect a DC test ammeter with a range of 0-150A 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).
An inductive-type ammeter which enables measurements to be taken without disconnecting the generator output wire
is recommended. Using this equipment will lessen the possibility of a voltage drop caused by a loose "B" terminal
connection.
5. Connect a digital-type voltmeter between the generator "B" terminal and the battery (+) terminal. (Connect the (+) lead of
the voltmeter to the "B" terminal. Connect the (-) lead of the voltmeter to the battery (+) cable.)
6. Reconnect the negative battery cable.
7. Connect a tachometer or the scan tool.
8. Start the engine.
9. With the engine running at approx. 2500 r/min, turn the headlights and other lights on and off to adjust the generator load
on the ammeter slightly above 30A.
max. 0.3V
When the generator output is high and the value displayed on the ammeter does not decrease to 30A, set the value to
40A.Read the value displayed on the voltmeter. In this case the limit becomes max. 0.4V.
10. If the value displayed on the voltmeter is still above the limit, a malfunction in the generator output wire may exist. Check
the wiring between the generator "B" terminal and the battery (+) terminal (including fusible link). If a terminal is not
sufficiently tight or if the harness has become discolored due to overheating, repair, the test again.
11. After the test, run the engine at idle.
12. Turn off all lights and turn the ignition switch to the OFF position.
13. Disconnect the tachometer or the scan tool.
14. Disconnect the negative battery cable.
15. Disconnect the ammeter and voltmeter.
Page 5 of 6
24.04.2008
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