Nissan Z - ZX 1970-1988 Repair Guide

Regulator

Print

REMOVAL & INSTALLATION



1970-77 Models
  1. Disconnect the negative battery cable.
  2.  
  3. Unplug the connection between the regulator and wiring harness.
  4.  
  5. Remove the two mounting bolts and the regulator.
  6.  
  7. To install, reverse the removal procedures. Make sure to leave the battery disconnected until the last step.
  8.  

1978-83 Models

The transistorized regulator is soldered to the brush assembly inside the alternator. It is non-adjustable and must be replaced together with the brush assembly if faulty.

  1. Remove the alternator.
  2.  
  3. Remove the through bolts and separate the front cover from the stator housing.
  4.  
  5. Unsolder the stator lead wires from the diode terminals. Remove the screws securing the brush assembly. Remove the stator from the rear cover.
  6.  
  7. Unsolder the wires at the diode terminal. Remove the mounting screws, then the brush assembly and regulator.
  8.  
  9. To install, reverse the removal procedures.
  10.  

Apply soldering heat sparingly, carrying out the operation as quickly as possible to avoid heat damage to the transistors and diodes. Before assembling the alternator halves, bend a piece of wire into an "L'' and slip it through the rear cover next to the brushes. Use the wire to hold the brushes in a retracted position until the case halves are assembled. Remove the wire carefully to prevent damage to the slip rings.

VOLTAGE ADJUSTMENT



1970-77 Models

See Figures 1, 2, 3 and 4

  1. Using an ammeter rated at 10 amps, a 30-volt voltmeter and a 1 / 4 ohm resistor, connect a test circuit as shown in the illustrations.
  2.  

On 1970-72 models, the regulator must be disconnected and held with the connector plug downward.

  1. Be sure to short the circuit between the fuse box side of the resistor and the negative terminal of the ammeter every time the engine is started. Then, disconnect the short circuit wire during testing.
  2.  
  3. Turn OFF all of the accessories. Operate the engine at 2,500 rpm for several minutes.
  4.  
  5. Make sure that the ammeter reading is below 5 amps. If not, the battery must be charged or another battery substituted so that the test may be made with the amperage within this range. Stop the engine.
  6.  
  7. Wait several minutes, then start the engine and slowly increase the speed to 2,500 rpm.
  8.  
  9. Compare the reading with the chart, allowing for the temperature around the regulator.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Connections for voltage measurement



Click image to see an enlarged view

Fig. Fig. 2: Regulator core gap adjustment



Click image to see an enlarged view

Fig. Fig. 3: Regulator coil point gap adjustment



Click image to see an enlarged view

Fig. Fig. 4: Regulator voltage adjustment

  1. If the voltage is not within the specified range, adjust it as follows:
    1. Adjust the voltage regulator core gap by loosening the screw which is used to secure the contact set on the yoke and move the contact up or down as necessary. Retighten the screw; the gap should be 0.6-1.0mm.
    2.  
    3. Adjust the point gap of the voltage regulator coil by loosening the screw used to secure the upper contact and move the upper contact up or down. The gap should be 0.30-0.40mm (1970-75) or 0.35-0.45mm (1976-77).
    4.  
    5. The core gap and point gap on the charge relay coil is or are adjusted in the same manner as previously outlined for the voltage regulator coil. The core gap is to be set at 0.8-1.0mm and the point gap adjusted to 0.4-0.6mm.
    6.  
    7. The regulated voltage is adjusted by loosening the locknut and turning the adjusting screw clockwise to increase or counterclockwise to decrease the regulated voltage. The voltage should be between 14.3-15.3 volts at 68°F (20°C).
    8.  

  2.  

 
label.common.footer.alt.autozoneLogo