Nissan 240SX/Altima 1993-1998 Repair Guide

Alternator

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TESTING



The easiest way to test the performance of the alternator is to perform a regulated voltage test.

  1. Start the engine and allow it to reach operating temperature.
  2.  
  3. Connect a voltmeter between the positive and negative terminals of the battery.
  4.  
  5. Voltage should be 14.1-14.7 volts.
  6.  
  7. If voltage is higher or lower than specification, connect a voltmeter between the battery positive (B+) voltage output terminal of the alternator and a good engine ground.
  8.  
  9. Voltage should be 14.1-14.7 volts.
  10.  
  11. If voltage is still out of specification, a problem exists in the alternator or voltage regulator.
  12.  
  13. If voltage is now within specification, a problem exists in the wiring to the battery or in the battery itself.
  14.  

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.

REMOVAL & INSTALLATION



See Figures 1, 2 and 3



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Fig. Fig. 1: On Altima models, the upper radiator hose must be removed to access the alternator



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Fig. Fig. 2: With the upper radiator hose removed, the alternator is easily serviced by disconnecting the electrical harnesses and removing the indicated bolts



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Fig. Fig. 3: The Altima's alternator is removed from the top of the engine compartment

  1. Disconnect negative battery cable.
  2.  
  3. On 240SX models, remove the engine undercover.
  4.  
  5. Loosen the adjusting bolt and remove the accessory drive belt.
  6.  
  7. Label and disconnect the alternator's electrical harness.
  8.  
  9. On 240SX models, remove the cooling fan lower shroud.
  10.  
  11. Remove the alternator mounting bolts.
  12.  
  13. Carefully remove the alternator from the engine. On Altima models, lift the alternator up and out of the engine compartment; on 240SX models, lower it from the underside.
  14.  

To install:
  1. Position the alternator on the engine.
  2.  
  3. Install the alternator mounting bolts and tighten to 11-15 ft. lbs. (16-3 Nm).
  4.  
  5. On 240SX models, install the cooling fan lower shroud.
  6.  
  7. Connect the electrical harness.
  8.  
  9. Install and properly tension the accessory drive belt.
  10.  
  11. On 240SX models, install the engine undercover.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Check the alternator for proper operation.
  16.  

 
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