Silverado 2008

Alternator

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Removal & Installation



4.3L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the air cleaner outlet resonator.

    Click image to see an enlarged view

    Fig. Air cleaner outlet resonator assembly-4.3L engines

  6.  
  7. Remove the drive belt.
  8.  
  9. Remove the engine wiring at the air conditioning compressor.
  10.  
  11. Remove the compressor and condenser hose bracket bolt.
  12.  
  13. Remove the heater outlet hose clamp bolt at the alternator bracket.
  14.  
  15. Disconnect the electrical wiring at the alternator.
  16.  
  17. Remove the alternator retaining bolts.
  18.  
  19. Remove the component from its mounting.

    Click image to see an enlarged view

    Fig. Alternator and related components-4.3L engines

  20.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Position the alternator to its mounting.
  2.  
  3. Tighten the retaining bolts to 37 ft. lbs. (50 Nm).
  4.  
  5. Continue the installation in the reverse order of the removal procedure.
  6.  
  7. Connect the battery cable.
  8.  
  9. Check for proper system operation. Correct as required.
  10.  

4.8L, 5.3L & 6.0L Engines

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the upper intake manifold sight shield.

    Click image to see an enlarged view

    Fig. Upper intake manifold sight shield-4.8L, 5.3L & 6.0L engines

  6.  
  7. Remove the drive belt.
  8.  
  9. Disconnect the electrical connectors from the alternator.
  10.  
  11. Remove the alternator retaining bolts.
  12.  
  13. Remove the component from its mounting.

    Click image to see an enlarged view

    Fig. Alternator and related components-4.8L, 5.3L & 6.0L engines

  14.  

To install:


NOTE
Be sure to use new fasteners, as required.

  1. Position the alternator to its mounting.
  2.  
  3. Tighten the retaining bolts to 41 ft. lbs. (55 Nm).
  4.  
  5. Continue the installation in the reverse order of the removal procedure.
  6.  
  7. Connect the battery cable.
  8.  
  9. Check for proper system operation. Correct as required.
  10.  

Testing



Load Test

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. With the engine running, turn on the blower motor and the high beams (or other electrical accessories to place a load on the charging system).
  4.  
  5. Increase and hold engine speed to 2000 rpm.
  6.  
  7. Measure the voltage reading at the battery.
  8.  
  9. The voltage should increase at least 0.5 volts from the voltage test. If the voltage does not meet specifications, the charging system is malfunctioning.
    NOTE
    Usually under and overcharging is caused by a defective alternator, or its related parts (regulator), and replacement will fix the problem; however, faulty wiring and other problems can cause the charging system to malfunction. Many automotive parts stores have alternator bench testers available for use by customers. An alternator bench test is the most definitive way to determine the condition of your alternator.

  10.  

No-Load Test

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Connect a tachometer to the engine.
    CAUTION
    Ensure that the transmission is in Park and the emergency brake is set. Blocking a wheel is optional and an added safety measure.

  4.  
  5. Turn off all electrical loads (radio, blower motor, wipers, etc.)
  6.  
  7. Start the engine and increase engine speed to approximately 1500 rpm.
  8.  
  9. Measure the voltage reading at the battery with the engine holding a steady 1500 rpm. Voltage should have raised at least 0.5 volts, but no more than 2.5 volts.
  10.  
  11. If the voltage does not go up more than 0.5 volts, the alternator is not charging. If the voltage goes up more than 2.5 volts, the alternator is overcharging.
    NOTE
    Usually under and overcharging is caused by a defective alternator, or its related parts (regulator), and replacement will fix the problem; however, faulty wiring and other problems can cause the charging system to malfunction. Many automotive parts stores have alternator bench testers available for use by customers. An alternator bench test is the most definitive way to determine the condition of your alternator.

  12.  
  13. If the voltage is within specifications, proceed to the next test.
  14.  

Voltage Test

Specific to:

Chevrolet Silverado 1500 2008

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Make sure the engine is OFF , and turn the headlights on for 15-20 seconds to remove any surface charge from the battery.
  4.  
  5. Using a DVOM set to volts DC, probe across the battery terminals.
  6.  
  7. Measure the battery voltage.
  8.  
  9. Write down the voltage reading and proceed to the next test.
  10.  

 
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