MINI 2002-05

Alternator

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Diagnosis & Testing



Visually check the alternator wiring and listen for abnormal noises. Check that the wiring is in good condition. Check that there is no abnormal noise from the alternator while the engine is running.

Alternator Load Test
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Connect a voltmeter and ammeter to the charging circuit as follows: .
    1. Disconnect the wire from terminal B of the alternator, and connect it to the negative (-) tester probe of the ammeter.
    2.  
    3. Connect the positive (+) tester probe of the ammeter to the output terminal of the alternator.
    4.  
    5. Connect the positive (+) tester probe of the voltmeter to the output terminal of the alternator.
    6.  
    7. Ground the negative (-) tester probe of the voltmeter.
    8.  

  4.  
  5. With the engine running at 2,000 rpm, turn on the high beam headlights and set the heater blower switch to HI.
  6.  
  7. Check the reading on the ammeter. Standard amperage: 30 A or more
  8.  
  9. If the ammeter reading is less than the standard amperage, repair the alternator.
  10.  

Alternator No-Load Test
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Connect a voltmeter and ammeter to the charging circuit as follows: .
    1. Disconnect the wire from terminal B of the alternator, and connect it to the negative (-) tester probe of the ammeter.
    2.  
    3. Connect the positive (+) tester probe of the ammeter to the output terminal of the alternator.
    4.  
    5. Connect the positive (+) tester probe of the voltmeter to the output terminal of the alternator.
    6.  
    7. Ground the negative (-) tester probe of the voltmeter.
    8.  

  4.  
  5. With the engine running from idling to 2,000 rpm, check the reading on the ammeter and voltmeter.
  6.  
  7. With no load on the system, the amperage should be 10 A or less, and the voltage should be 13.2-14.0 volts.
  8.  
  9. If the voltmeter reading is more than the standard voltage, replace the voltage regulator.
  10.  
  11. If the voltmeter reading is less than the standard voltage, check the voltage regulator and alternator.
  12.  

Removal & Installation




NOTE
When the battery is disconnected the radio code, on-board computer and clock settings will be lost. The radio code should be obtained before disconnecting the battery or radio. Once the battery has been reconnected, the radio will not function unless the code is keyed in.


NOTE
When the battery is disconnected the radio code, on-board computer and clock settings will be lost. The radio code should be obtained before disconnecting the battery or radio. Once the battery has been reconnected, the radio will not function unless the code is keyed in.

Cooper Coupe
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Check for stored fault codes, then erase code memory.
  4.  
  5. Switch off ignition.
  6.  
  7. Disconnect negative battery cable.
  8.  
  9. Remove or disconnect the following:

    Alternator drive belt
     
    Electrical connections from alternator
     
    Alternator mounting bolts
     
    Alternator
     

  10.  

To install:

  1. To install, reverse removal procedure.
  2.  
  3. Torque alternator mounting bolts to 18 ft. lbs. (25 Nm) and the power lead to the alternator stud to 7 ft. lbs. (10 Nm).
  4.  
  5. Check for any stored fault codes.
  6.  
  7. Clear fault code memory.
  8.  

  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Check for stored fault codes, then erase code memory.
  4.  
  5. Switch off ignition.
  6.  
  7. Disconnect negative battery cable.
  8.  
  9. Remove or disconnect the following:

    Alternator drive belt
     
    Electrical connections from alternator
     
    Alternator mounting bolts
     
    Alternator
     

  10.  

To install:

  1. To install, reverse removal procedure.
  2.  
  3. Torque alternator mounting bolts to 18 ft. lbs. (25 Nm) and the power lead to the alternator stud to 7 ft. lbs. (10 Nm).
  4.  
  5. Check for any stored fault codes.
  6.  
  7. Clear fault code memory.
  8.  

Cooper S Coupe
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Check for stored fault codes, the erase fault code memory.
  4.  
  5. Switch off ignition.
  6.  
  7. Disconnect the battery.
  8.  
  9. Remove or disconnect the following:

    Alternator drive belt
     
    Front bumper cover
     

  10.  
  11. Loosen the retainers for the modular front end and insert bracing tools, 11-8-401/2, to provide access room.
  12.  
  13. Detach the electrical connections from the alternator.
  14.  
  15. Remove the mounting bolts and remove the alternator.
  16.  

To install:

  1. To install, reverse removal procedure.
  2.  
  3. Torque alternator mounting bolts to 18 ft. lbs. (25 Nm) and the power lead to the alternator stud to 7 ft. lbs. (10 Nm).
  4.  
  5. Check for any stored fault codes.
  6.  
  7. Clear fault code memory.
  8.  


    Click image to see an enlarged view

    Fig. Installing special tools to move modular front end for alternator access-Cooper S Coupe models


  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Check for stored fault codes, the erase fault code memory.
  4.  
  5. Switch off ignition.
  6.  
  7. Disconnect the battery.
  8.  
  9. Remove or disconnect the following:

    Alternator drive belt
     
    Front bumper cover
     

  10.  
  11. Loosen the retainers for the modular front end and insert bracing tools, 11-8-401/2, to provide access room.
  12.  
  13. Detach the electrical connections from the alternator.
  14.  
  15. Remove the mounting bolts and remove the alternator.
  16.  

To install:

  1. To install, reverse removal procedure.
  2.  
  3. Torque alternator mounting bolts to 18 ft. lbs. (25 Nm) and the power lead to the alternator stud to 7 ft. lbs. (10 Nm).
  4.  
  5. Check for any stored fault codes.
  6.  
  7. Clear fault code memory.

    Click image to see an enlarged view

    Fig. Installing special tools to move modular front end for alternator access-Cooper S Coupe models

  8.  

 
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