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INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using a vernier caliper, measure the exposed brush length
  Standard length:
  
  10.5 mm (0.413 in.)
  
  Minimum length:
  
  4.5 mm (0.177 in.)
  
  Fig 1: Measuring Exposed Brush Length
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the exposed brush length is less than the minimum, replace the generator brush holder assembly.
INSPECT GENERATOR ROTOR ASSEMBLY
1. Inspect the generator rotor bearing
  1. When rotating the generator rotor bearing, check that the generator rotor bearing does not stuck and that there is no unusual noise If the generator rotor bearing stuck or there is unusual noise, replace the generator rotor assembly.
  Fig 2: Checking Generator Rotor Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance
  
  Fig 3: Measuring Resistance Between Slip Rings
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Measure the resistance between the slip rings.
    Standard resistance:
    
    1.5 to 1.9 Ω
    
    If the resistance is not within the specified range, replace the generator rotor assembly.
  2. Measure the resistance between the slip ring and rotor core.
    
    Fig 4: Measuring Resistance Between Slip Ring And Rotor Core
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard resistance:
    
    1 MΩ or more
    
    If the resistance is not within the specified range, replace the generator rotor assembly.
3. Measure the diameter
  
  Fig 5: Measuring Diameter Of Slip Ring
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Using a vernier caliper, measure the diameter of the slip ring.
  Standard diameter:
  
  14.2 to 14.4 mm (0.559 to 0.567 in.)
  
  Minimum diameter:
  
  14.0 mm (0.551 in.)
  
  If the diameter is less than the minimum, replace the generator rotor assembly.
INSPECT GENERATOR ROTOR BEARING
1. When rotating the generator rotor bearing, check that the generator rotor bearing does not become stuck and that there is no unusual noise If the generator rotor bearing becomes stuck or there is unusual noise, replace the generator rotor bearing.
  
  Fig 6: Checking Generator Rotor Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply: