Toyota Supra 1990 Manual page 382

CH-10
No continuity
Continuity
No continuity
CHARGING SYSTEM - Alternator
CH0190
CH0191
CH0192
CH0245
CH0246
INSPECTION AND REPAIR OF ALTERNATOR
Rotor
1. INSPECT ROTOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the slip rings.
Standard resistance (eold): 2.8 - 3.0
n
If there is no continuity, replace the rotor.
2. INSPECT ROTOR FOR GROUND
Using an ohmmeter, check that there is no continuity be-
tween the slip ring and the rotor.
If there is continuity, replace the rotor.
3. INSPECT SLIP RINGS
(a) Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor.
(b) Using vernier calipers, measure the slip ring diameters.
Standard diameter: 14.2 - 14.4 mm
(0.559 - 0.567 in.)
Minimum diameter: 12.8 mm (0.504 in.)
If the diameter is less than minimum, replace the rotor.
Stator
1. INSPECT STATOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the coil leads.
If there is no continuity, replace the drive end frame as-
sembly.
2. INSPECT STATOR FOR GROUND
Using an ohmmeter, check that there is no continuity be-
tween the coil leads and drive end frame.
If there is continuity, replace the drive end frame assembly.