toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Rotor, Alternator|Testing and Inspection|Page 5170 > < Rectifier Diode / Bridge, Alternator|Testing and Inspection
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Rotor: Testing and Inspection

Rotor

1. INSPECT ROTOR FOR OPEN CIRCUIT.

Using an ohmmeter, check that there is continuity between the slip rings.

Standard Resistance:

At 20°C (680°F): 2.7 - 3.1 ohms

If there is no continuity, replace the rotor.

2. INSPECT ROTOR FOR GROUND.

Using an ohmmeter, check that there is no continuity between the slip ring and 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 a vernier caliper, measure the slip ring diameter.

Standard Diameter:

14.2 - 14.4 mm (0.559 - 0.567 in.)

Minimum Diameter:

12.8 mm (0.504 in.)

Rotor, Alternator|Testing and Inspection|Page 5170 > < Rectifier Diode / Bridge, Alternator|Testing and Inspection