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ELECTRICAL SYSTEM 16-39
Charging System
•
To check the alternator output voltage, do the following
procedures.
Turn the ignition switch off.
Remove the fuel tank (see Fuel Tank Removal in the Fuel
System (DFI) chapter).
Disconnect the alternator lead connector [A].
Connect a tester as shown in the table 1.
Install the fuel tank temporary (see Fuel Tank Installation
in the Fuel System (DFI) chapter).
Start the engine.
Run it at the rpm given in the table 1.
Note the voltage readings (total 3 measurements).
Table 1 Alternator Output Voltage at 4 000 r/min (rpm)
Connections
Tes te r ( +) to Tes ter ( –) to
Reading
One Black lead
Another Black lead
AC 51 V or more
If the output voltage shows the value in the table, the al-
ternator operates properly.
If the output voltage shows a much lower reading than
that given in the table, stop the engine and inspect the
stator coil resistance.
•
Check the stator coil resistance as follows.
Stop the engine.
Connect the tester as shown in the table 2.
Note the readings (total 3 measurement).
Table 2 Stator Coil Resistance at 20°C (68°F)
Connections
Tes te r ( +) to Te st er (– ) to
Reading
One Black lead Another Black lead 0.18 ∼ 0.28
If there is more resistance than shown in the table, or
no tester reading (infinity) for any two leads, the stator
has an open lead and must be replaced. Much less than
this resistance means the stator is shorted, and must be
replaced.
•
Measure the resistance between each of the black leads
and chassis ground.
Any tester reading less than infinity () indicates a short,
necessitating stator replacement.
If the stator coils have normal resistance, but the voltage
check showed the alternator to be defective; then the rotor
magnets have probably weakened, and the rotor must be
replaced.
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