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Diagnosis and repair



TEST PROCEDURES


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1.Disconnect electric choke, if equipped.
2.Disconnect voltage regulator wiring connector.
3.Connect a jumper wire between the ``A and ``F terminals of voltage regulator wiring connector, Fig. 9.
4.Connect voltmeter to battery clamps. Then start and idle engine.
5.Observe and note voltmeter reading.
6.Move voltmeter positive lead to the alternator ``S terminal and note voltage reading.

TEST RESULTS


1.If voltmeter reading is within 1/2 of battery voltage, diodes are satisfactory.
2.If voltmeter reading is approximately 1.5 volts, the alternator has a shorted negative diode or a grounded stator winding.
3.If voltmeter reading is approximately 1.5 volts less than battery voltage, the alternator has a shorted positive diode.
4.If voltage reading is approximately 1 to 1.5 volts less than 1/2 battery voltage, the alternator has an open positive diode.
5.If voltage reading is 1 to 1.5 volts above 1/2 battery voltage, the alternator has an open negative diode.
6.Reconnect electric choke into circuit after tests are completed, if equipped.TEST PROCEDURES


Fig. 9 Regulator Plug. Jumper Wire ConnectorFig. 9 Regulator Plug. Jumper Wire Connector





1.Disconnect electric choke, if equipped.
2.Disconnect voltage regulator wiring connector.
3.Connect a jumper wire between the ``A and ``F terminals of voltage regulator wiring connector, Fig. 9.
4.Connect voltmeter to battery clamps. Then start and idle engine.
5.Observe and note voltmeter reading.
6.Move voltmeter positive lead to the alternator ``S terminal and note voltage reading.

TEST RESULTS


1.If voltmeter reading is within 1/2 of battery voltage, diodes are satisfactory.
2.If voltmeter reading is approximately 1.5 volts, the alternator has a shorted negative diode or a grounded stator winding.
3.If voltmeter reading is approximately 1.5 volts less than battery voltage, the alternator has a shorted positive diode.
4.If voltage reading is approximately 1 to 1.5 volts less than 1/2 battery voltage, the alternator has an open positive diode.
5.If voltage reading is 1 to 1.5 volts above 1/2 battery voltage, the alternator has an open negative diode.
6.Reconnect electric choke into circuit after tests are completed, if equipped.


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