Toyota Cressida/Corona/Crown/MarkII 1970-1982 Repair Guide

IC Regulator

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The IC regulator is mounted on the alternator housing, is transistorized and is non-adjustable.

REMOVAL & INSTALLATION



  1. Disconnect the negative (ground) battery cable from the battery.
  2.  
  3. Remove the end cover of the regulator.
  4.  
  5. Remove the three screws that go through the terminals.
  6.  
  7. Remove the (two) top mounting screws that mount the regulator to the alternator. Remove the regulator.
  8.  
  9. To install the new IC regulator. Place the regulator in position on the alternator. Install and secure the (two) top mounting screws. Install the (three) terminal screws. Install the end cover.
  10.  
  11. Reconnect the battery ground cable.
  12.  

TESTING





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Fig. Fig. 1 Test the IC type voltage regulator as shown

To test the IC regulator you will need a voltmeter and an ammeter.

  1. Disconnect the wire connected to the B terminal of the alternator. Connect the wire (that you disconnected) to the negative (minus) terminal of the ammeter.
  2.  
  3. Connect the test lead from the positive (plus) terminal of the ammeter to the B terminal of the alternator.
  4.  
  5. Connect the positive (plus) lead of the voltmeter to the B terminal of the alternator.
  6.  
  7. Connect the negative (minus) lead of the voltmeter to ground.
  8.  
  9. Start the engine and run at about 2000 rpm. Check the reading on the ammeter and voltmeter. Standard amperage should be less than 10 amps. Standard voltage should be from 14 to 14.7 volts (Temperature 77°F).
  10.  
  11. If the voltage is greater than 15 volts, replace the IC regulator.
  12.  
  13. If the voltage reading is less than 13.5 volts, shut off the engine and check the regulator and alternator as follows.
  14.  
  15. Turn the ignition switch to ON. Check the voltage at the IG terminal of the alternator. If no voltage, check the ENGINE fuse and/or the ignition switch. No problems found, go to next step.
  16.  
  17. Remove the end cover from the IC regulator. Check the voltage reading at the regulator L terminal. If the voltage reading is zero to 2 volts, suspect the alternator.
  18.  
  19. If the voltage is the same as battery voltage, turn off the ignition switch (OFF position) and check for continuity between the regulator L and F terminals.
  20.  
  21. If there is no continuity, suspect the alternator. If there is continuity (approx. 4 omega ) replace the IC regulator.
  22.  



Click image to see an enlarged view

Fig. Fig. 2 Alternator and Regulator Specifications

 
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