Mazda 323/626/929/GLC/MX-6/RX-7 1978-1989

Regulator

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All 1978-80 models, except the 626, are equipped with separate voltage regulators that can be adjusted. While all 1981-89 models have IC (integrated circuit) voltage regulators located inside the alternator housing. These are not adjustable, and can only be replaced. All service on IC regulators should be referred to a qualified technician.

REMOVAL & INSTALLATION



1978-79 GLC and RX-7
  1. Disconnect the battery ground cable at the negative (-) battery terminal.
  2.  
  3. Disconnect the wiring from the regulator.
  4.  
  5. Remove the regulator mounting screws.
  6.  
  7. Remove the regulator.
  8.  

To install:
  1. Install the new regulator and attach with the mounting screws.
  2.  
  3. Connect the regulator wiring.
  4.  
  5. Connect the negative battery cable.
  6.  

VOLTAGE ADJUSTMENTS



1978-79 GLC and RX-7

See Figures 1 and 2

  1. Remove the cover from the regulator.
  2.  
  3. Check the air gap, point gap and back gap with a feeler gauge (see illustration).
  4.  
  5. If they do not fall within the specifications given in the Alternator and Regulator Specifications chart, adjust the gap(s) by bending the stationary contact bracket.
  6.  



Click image to see an enlarged view

Fig. Fig. 1: The air gap, point gap and back gap are adjustable on 1978-79 GLC and RX-7 voltage regulators



Click image to see an enlarged view

Fig. Fig. 2: On the 1979 RX-7, connect a voltmeter between the A and E terminals of the voltage regulator

  1. Connect a voltmeter between the A and E terminals of the regulator, on the RX-7. On the GLC, connect a voltmeter between the top terminal of the alternator and the coil mounting bolt.
  2.  

Be sure that the car's battery is fully charged before proceeding with this test. The ammeter must read 5 amps or less.

  1. Start the engine and run it at the rpm specified in the accompanying chart. The voltage reading should as specified in the same chart.
  2.  
  3. Stop the engine.
  4.  
  5. Bend the upper plate down to decrease the voltage setting, or up to increase the setting, as required.
  6.  
  7. If the regulator cannot be brought within specifications, replace it.
  8.  
  9. When the test is completed, disconnect the voltmeter and replace the regulator cover.
  10.  

 
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