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    2007 Jeep Compass

    Alternator

    Print

    Removal & Installation



    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Disconnect and isolate the negative battery cable at the battery.
    4.  
    5. Remove the right front wheel.
    6.  
    7. Remove the underbody air dam.
    8.  
    9. Remove the accessory drive splash shield.
    10.  
    11. Remove the accessory drive idler pulley.
    12.  
    13. Loosen the lower mounting bolt.
    14.  
    15. Loosen the A/C compressor and relocate, pull down and to the outboard side of vehicle to make room to remove the alternator.
    16.  
    17. Unplug the field circuit from the alternator.
    18.  
    19. Remove the B+ terminal nut and wire.
    20.  
    21. Remove the upper mounting bolt.
    22.  
    23. Remove the alternator lower mounting bolt.
    24.  
    25. Relocate the battery terminal to the other side of the A/C line for removal of the alternator.
    26.  
    27. Rotate the alternator pulley down.
    28.  
    29. Slide the alternator down and out of the vehicle.
    30.  

    To install:

    1. Move the A/C compressor to the side to install the alternator.
    2.  
    3. Rotate the alternator and set it in place.
    4.  
    5. Make sure the battery terminal (1) is in front of the A/C line (2).

      Click image to see an enlarged view

      Fig. Make sure the battery terminal (1) is in front of the A/C line (2)-Alternator installation

    6.  
    7. Install the lower mounting bolt, do not tighten fully at this time.
    8.  
    9. Loosely install the upper mounting bolt.
    10.  
    11. Tighten the lower and upper mounting bolts to 40 ft. lbs. (54 Nm).
    12.  
    13. Install the B+ terminal nut and wire and tighten to 89 inch lbs. (10 Nm).
    14.  
    15. Plug in the field circuit to the alternator.
    16.  
    17. Install the idler pulley and tighten the bolt.
    18.  
    19. Install the accessory drive belt. Refer to Accessory Drive Belts, removal & installation.
    20.  
    21. Install the splash shield.
    22.  
    23. Install the lower air dam.
    24.  
    25. Lower the vehicle.
    26.  
    27. Connect the negative battery cable.
    28.  

    Testing



    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    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. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Check that the wiring is in good condition.
    4.  
    5. Check for any abnormal noise from the alternator while the engine is running. Noise emitting from the alternator may be caused by:

      Worn, loose, or defective bearings
       
      Loose or defective drive pulley
       
      Incorrect, worn, damaged, or misadjusted drive belt
       
      Loose mounting bolts
       
      Misaligned drive pulley
       
      Defective stator or diode
       
      Damaged internal fins
       

    6.  
    7. Check the accessory drive belt for wear or slipping.
    8.  
    9. With the engine running at 2,500 RPM, headlights ON and fan blower on high:
      1. The alternator output voltage should be 13.0-16.0 volts at 68°F.
      2.  
      3. The alternator nominal rating is 140-160 Amps with minimum output amperage, under test conditions, of 90-110 Amps.
      4.  

    10.  

    Load Test

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    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 in order to place a load on the charging system).
    4.  
    5. Increase and hold the engine speed to 2,000 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 the alternator.

    10.  

    No Load Test

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Connect a tachometer to the engine.
      CAUTION
      Ensure that the transaxle is in Park , or Neutral (Manual transaxles), and the emergency brake is set. Blocking a wheel is optional as an added safety measure.

    4.  
    5. Turn off all electrical loads (radio, blower motor, wipers, etc.).
    6.  
    7. Start the engine and increase the engine speed to approximately 1,500 RPM.
    8.  
    9. Measure the voltage reading at the battery with the engine holding a steady 1,500 RPM. The 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 may be 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 the alternator.

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

    Voltage Test

    Specific to:

    Jeep Compass 2007-2009

    Jeep Patriot 2007-2009

    1. Before servicing the vehicle, refer to the Precautions Section.
    2.  
    3. Make sure the engine is OFF , turn the headlights on for 15-20 seconds to remove any surface charge from the battery.
    4.  
    5. Using a volt meter, 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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