Service Manual
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Charging System Operational Inspection
ELECTRICAL SYSTEM 7-11
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Check battery condition.
NOTE
OAlways check battery condition before condemning other parts of
the charging system. The baitery must be fully charged in order to
conduct accurate charging system tests.
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Warm up the engine to bring the components up to their normal
operating temperatures.
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Measure regulated output voltage at various engine speeds.
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Connect a voltmeter across the battery terminals.
*The readings should show nearly battery voltage when the engine
speed is low, and as the engine speed rises, the readings should also
rise. But they must stay within the specified range.
*If the output voltage is much higher than the specification, the
regulator is defective, or the regulator leads are loose or open.
*If the output voltage does not rise as the engine speed increase, the
regulator is defective or the alternator output is insufficient for the
loads.
Regulated Output Voltage
Battery Voltage to 15 VDC
Stator Coil Resistance
@Disconnect the PACKARD 6P connector.
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Measure the stator coil resistance.
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Connect an ohmmeter between stator pins.
Stator Coil Resistance
0.11 to 0.18 R
*If the meter does not read as specified, replace the alternator stator.
*lf.the coil has normal resistance, but the voltage inspect showed the
alternator to be defective; the rotor magnets have probably weakened,
and the rotor must be replaced.
1. To Stator
3. PACKARD 6P connector
2. Ohm Meter
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Check for continuity between each stator pin and ground. There
should be no continuity (infinite ohm).
*If the stator coil fails any of these tests, replace the coil with a new one.
1. To Stator
2. PACKARD 6P Connector
Unregulated Stator Output
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Disconnect the PACKARD 6P connector.
@Connect AC voltmeter to the stator pins.
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Start the engine. Run the engine at the 3 000 rpm speed.
@Voltage reading should be minimum 26 VAC/3 000 rpm.
*If the AC voltage reading is less than the specification replace the
stator.
Unregulated Stator Output (MIN)
28 VACl3 000 rpm
1. PACKARD 6P Connector 3. AC Voltmeter
2. To Stator