Miata 1990-1997

Alternator

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Removal & Installation



1.6L Engine

Specific to:

Mazda Miata 1990-1993


NOTE
Voltage regulator is of the internal type.

  1. Disconnect the negative battery cable
  2.  
  3. Disconnect the vacuum hose and remove the solenoid bracket, if equipped
  4.  
  5. Remove the alternator drive belt
  6.  
  7. Label and disconnect the electrical connectors from the alternator
  8.  
  9. Remove the alternator pivot and adjusting bar bolts and remove the alternator
  10.  
  11. Installation is the reverse of the removal procedure. Adjust the belt tension
  12.  

1.8L Engine

Specific to:

Mazda Miata 1994-1997


NOTE
Voltage regulator is of the internal type.

  1. Disconnect the negative battery cable
  2.  
  3. Label and disengage the power steering pressure switch, water thermoswitch and idle air control valve electrical connectors
  4.  
  5. Remove the intake air pipe
  6.  
  7. Disconnect the electrical connectors from the alternator
  8.  
  9. Remove the alternator upper mounting bolt
  10.  
  11. Loosen the alternator adjusting bolt and remove the drive belt from the alternator pulley
  12.  
  13. Remove the alternator lower through-bolt, and remove the alternator
  14.  

    To install:

  15. Install the alternator with the through-bolt
  16.  
  17. Connect the alternator electrical connectors
  18.  
  19. Install the drive belt and upper mounting bolt. Adjust the belt tension. Tighten the lower through-bolt to 28-38 ft. lbs. (38-51 Nm) and the upper mounting bolt to 14-18 ft. lbs. (19-25 Nm)
  20.  
  21. Install the intake air pipe
  22.  
  23. Engage the power steering pressure switch, water thermoswitch and idle air control valve electrical connectors
  24.  
  25. Connect the negative battery cable
  26.  

Testing



  1. Verify that the battery if fully charged.
  2.  
  3. Ensure that the alternator drive belt is in good condition, and proper belt tension is maintained.
  4.  
  5. Turn off all electrical loads. Ensure that the cooling fan does not run.
  6.  
  7. Turn the ignition switch to ON and verify that the alternator warning light is on. If not, inspect the bulb and the wire harness between the alternator and the bulb.
  8.  
  9. Turn the ignition switch to START and verify that the alternator turns smoothly, without any noise while the engine is running.
    CAUTION
    While the engine is running, keep yourself, loose clothing, long hair and any test equipment out of the path of rotating components. Severe injury or even death can occur.

  10.  
  11. Measure the voltage at the B + terminal of the alternator. The voltage should read 13.0-15.0 volts with the engine idling.
  12.  
  13. If the reading is not correct, check the charging system wiring harness. If the harness is OK, replace the alternator.
  14.  

 
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