LaCrosse 2006-2007

Alternator

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Diagnosis & Testing



The alternator provides power consuming components with current while the engine is running and maintains battery charge. The alternator is mounted on the front edge of the engine. The output of the alternator depends on engine speed. When the engine is idling, the alternator operates at approximately half of its maximum output. When the engine is idling with many power consuming components engaged, the alternator may be unable to maintain full battery charge.

The alternator creates an alternating current which is converted to a direct current in the rectifier bridge. The alternator also utilizes a built-in voltage regulator.

  1. Check that the wiring is in good condition.
  2.  
  3. Check for any abnormal noise from the alternator while the engine is running.
  4.  
  5. Check the accessory drive belt for wear or slipping.
    NOTE
    With the engine running at 2,500 RPM, headlights on and fan blower on high, the alternator output voltage should be 12.0-15.5 volts at 68°F.

  6.  

Removal & Installation



3.6L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the battery ground (negative) cable from the battery.
  4.  
  5. Remove the bolt and the nut from the engine mount strut at the left engine mount strut bracket on the engine. Remove the bolt and the nut from the engine mount strut at the engine mount strut bracket on the upper radiator support.
  6.  
  7. Remove the engine mount strut.

    Click image to see an enlarged view

    Fig. Engine mount strut-3.6L engine

  8.  
  9. Remove the bolt and the nut from the engine mount strut at the right engine mount strut bracket on the engine.
  10.  
  11. Remove the bolt and the nut from the engine mount strut at the engine mount strut bracket on the upper radiator support.
  12.  
  13. Remove the engine mount strut.
  14.  
  15. Remove the alternator B+ terminal nut and the battery cable from the alternator.
  16.  
  17. Disconnect the alternator electrical connector.
  18.  
  19. Remove the accessory drive belt from the alternator.
  20.  
  21. Remove the idler pulley.
  22.  
  23. Remove the alternator bolts.
  24.  
  25. Remove the alternator from the vehicle.

    Click image to see an enlarged view

    Fig. Alternator mounting-3.6L engine

  26.  

To install:

  1. Install the alternator to the vehicle.
  2.  
  3. Install the alternator bolts. Tighten the alternator bolts to 37 ft. lbs. (50 Nm).
  4.  
  5. Install the idler pulley. Tighten the accessory drive belt idler pulley bolt to 37 ft. lbs. (50 Nm).
  6.  
  7. Install the accessory drive belt.
  8.  
  9. Connect the alternator electrical connector.
  10.  
  11. Install the battery cable and the alternator B+ terminal nut to the alternator. Tighten the alternator B+ terminal nut 15 ft. lbs. (20 Nm).
  12.  
  13. Install the engine mount strut.
  14.  
  15. Install the bolt and the nut to the engine mount strut at the engine mount strut bracket on the upper radiator support. HAND TIGHTEN ONLY.
  16.  
  17. Install the bolt and the nut to the engine mount strut at the right engine mount strut bracket on the engine. Tighten both engine mount strut nuts to 35 ft. lbs. (48 Nm).
  18.  
  19. Install the engine mount strut.
  20.  
  21. Install the bolt and the nut to the engine mount strut at the engine mount strut bracket on the upper radiator support. HAND TIGHTEN ONLY.
  22.  
  23. Install the bolt and the nut to the engine mount strut at the left engine mount strut bracket on the engine. Tighten bolt engine mount strut nuts to 35 ft. lbs. (48 Nm).
  24.  
  25. Connect the battery ground (negative) cable to the battery.
  26.  

3.8L Engines
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Remove or disconnect the following:

    Negative battery cable
     
    Accessory drive belt
     
    Fuel injector sight shield
     
    Alternator brace
     
    Electrical connections
     
    Alternator bolts and the alternator
     

  4.  

To install:

  1. Install or connect the following:

    Alternator and torque the bolts to 37 ft. lbs. (50 Nm)
     
    Electrical connections and torque the nut to 111 inch lbs. (13 Nm)
     
    Alternator brace. Torque the nut to 37 ft. lbs. (50 Nm) and the bolt to 22 ft. lbs. (30 Nm).
     
    Fuel injector sight shield
     
    Accessory drive belt
     
    Negative battery cable
     

  2.  

 
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