If the output voltage shows the value in the table, the al-
ternator operates properly.
If the output voltage shows a much higher than the value
in the table, the regulator/rectifier is damaged. A much
lower reading than that given in the table indicates that
the alternator is defective.
Check the stator coil resistance as follows.
Stop the engine.
Connect the commercially available tester as shown in the
Note the readings (total 3 measurement).
Table 2 Stator Coil Resistance
Tester (+) to
× 1 Ω
One Black lead
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
Using the highest resistance range of the hand tester,
measure the resistance between each of the black leads
and chassis ground.
Any hand 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
Special Tool - Hand Tester: 57001-1394
Set up the Fuel Tank (see Speed Sensor Removal).
Tester (–) to
Another Black lead
ELECTRICAL SYSTEM 16-31
0.1 ∼ 0.3 Ω