Isuzu Cars and Trucks 1981-1991

External Voltage Regulator

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An external voltage regulator is used with the early model engines. The regulator is mounted on the left inner fender.

ADJUSTMENT
  1. Remove the regulator from the vehicle and remove the regulator cover.
  2.  
  3. If the points are pitted, clean them carefully with fine emery paper.
  4.  
  5. Check and adjust the core gap first and then the point gap.
  6.  
  7. Adjust the core gap by loosening the screws attaching the contact set to the yoke. Move the contact set up or down as required. The standard core gap is 0.6 and 191.0mm (0.024 and 190.039 in.). Tighten the attaching screw.
  8.  
  9. Adjust the point gap by loosening the screw attaching the upper contact. Move the upper contact up or down as required. The standard point gap is 0.3 and 190.4mm (0.012 and 190.016 in.).
  10.  
  11. Adjust the regulated voltage by turning the adjusting screw. Turn the adjusting screw in to increase voltage and out to reduce voltage. When the correct adjustment is obtained, secure the adjusting screw by tightening the locknut. The regulated voltage is 13.8 and 1914.8V.
  12.  
  13. Install the regulator cover, reconnect the electrical leads and install the regulator.
  14.  



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Fig. External voltage regulator adjustment

REMOVAL AND INSTALLATION
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect and label the electrical leads at the regulator.
  4.  
  5. Remove the 2 regulator mounting screws and remove the regulator.
  6.  

To install:

  1. Install the voltage regulator.
  2.  
  3. Connect the electrical leads to the regulator.
  4.  
  5. Connect the negative battery cable.
  6.  

 
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