Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Regulator

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Fig. Fig. 1 no caption

REMOVAL & INSTALLATION



1969-72 Models
  1. Disconnect the ground cable from the battery.
  2.  
  3. Disconnect the wiring harness from the regulator.
  4.  
  5. Remove the mounting screws and remove the regulator.
  6.  
  7. Make sure that the regulator base gasket is in place before installation.
  8.  
  9. Clean the attaching area for proper grounding.
  10.  
  11. Install the regulator. Do not overtighten the mounting screws, as this will cancel the cushioning effect of the rubber grommets.
  12.  

1973-82 Models

The regulator on these models is an integral part of the alternator. Alternator disassembly is required to replace it.

VOLTAGE ADJUSTMENT



1969-72 Models


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Fig. Fig. 2 Alternator and Regulator Specifications



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Fig. Fig. 3 Attach a voltmeter as shown for the voltage adjustment-1969-72 models

The standard voltage regulator is a conventional double contact unit, although an optional transistorized regulator was available. Voltage adjustment procedures are the same for both types except for the point of adjustment. The double contact adjusting screw is located under the cover and the transistorized regulator is adjusted externally after removing an allen screw from the adjustment hole.

  1. Insert a 1 / 4 ohm-25 watt fixed resistor into the charging circuit at the relay junction block, between both leads and the terminal Use a 1 / 2 ohm-25 watt resistor for 1971-72 models.
  2.  
  3. Install a voltmeter as shown in the illustration.
  4.  
  5. Warm the engine by running it for several minutes at 1500 rpm or more.
  6.  
  7. Cycle the voltage regulator by disconnecting and reconnecting the regulator connector.
  8.  
  9. Read the voltage on the voltmeter. If it is between 13.5 and 15.2 volts, the regulator does not need adjustment or replacement. If the voltage is not within these limits, leave the engine running at 1500 rpm.
  10.  
  11. Disconnect the four-terminal connector and remove the regulator cover (except on transistorized regulators). Reconnect the four-terminal connector and adjust the voltage to between 14.2 and 14.6 volts by turning the adjusting screw while observing the voltmeter.
  12.  
  13. Disconnect the terminal, install the cover, and then reconnect the terminal.
  14.  
  15. Continue running the engine at 1500 rpm to re-establish the regulator internal temperature.
  16.  
  17. Cycle the regulator by disconnecting/reconnecting the regulator connector. Check the voltage. If the voltage is between 13.5 and 15.2, the regulator is good.
  18.  


CAUTION
Always disconnect the regulator before removing or installing the cover in order to prevent damage by short-circuiting.

1973-82 Models

There is no voltage adjustment necessary or possible for the integral regulator.

 
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