Nissan Pick-ups and Pathfinder 1970-1988

Regulator

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All 1970-77 models are equipped with a separate, adjustable regulator. All 1978-88 models are equipped with a transistorized regulator which is attached to the brush assembly on the side of the alternator housing. If faulty, it must be replaced; there are no adjustments which can be made.

REMOVAL & INSTALLATION



1970-77
  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the wiring harness connector at the back of the regulator.
  4.  
  5. Remove the regulator mounting bolts.
  6.  
  7. Remove the regulator.
  8.  

To install:
  1. Install the regulator and tighten the mounting bolts.
  2.  
  3. Connect the wiring harness and the negative battery cable.
  4.  

1978-88

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 thru-bolts and separate the front cover from the stator housing.
  4.  
  5. Unsolder the wire connecting the diode plate to brush at the brush terminal.
  6.  
  7. Remove the bolt retaining the diode plate to the rear cover.
  8.  
  9. Remove the nut securing the battery terminal bolt.
  10.  
  11. Lift the stator slightly, together with the diode plate, to gain access to the diode plate screw. Remove the screw.
  12.  
  13. Separate the stator and diode, then remove the brush and regulator assembly.
  14.  
  15. On assembly, apply soldering heat sparingly, carrying out the operation as quickly as possible, to avoid heat damage to transistors and diodes. Before assembling the alternator halves, bend a piece of wire into an L-shape 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.
  16.  

ADJUSTMENT



1970-72

See Figures 1, 2 and 3

  1. Operate the alternator long enough to raise the temperature of the regulator to normal operating temperature.
  2.  
  3. Adjust the back gap of the voltage regulator coil by loosening the armature set screw and sliding the armature. The gap should be 0.035-0.039 in. (0.89-1.00mm).
  4.  
  5. Adjust the air gap of the voltage regulator coil by bending the primary contact support to the right or left with a pair of needlenose pliers. The gap should be 0.032-0.047 in. (0.80-1.20mm).
  6.  
  7. Adjust the point gap by bending the secondary contact support to the right or left with pliers. The gap should be 0.016-0.020 in. (0.40-0.50mm).
  8.  
  9. Adjust the pilot lamp relay coil yoke gap by loosening the armature set screw, adjusting the gap and retightening the set screw. The gap should be 0.008 in. (0.20mm).
  10.  
  11. Adjust the pilot lamp relay coil air gap by loosening the contact set screw and inserting a screwdriver in the hole provided and moving the points up or down. The gap should be 0.020-0.024 in. (0.50-0.60mm).
  12.  
  13. Adjust the pilot lamp relay coil point gap by loosening the contact point retaining screw and inserting a screwdriver in the hole provided and moving the point contact either up or down. The gap should be between 0.016-0.020 in.(0.40-0.50mm).
  14.  
  15. Adjust the voltage valve by bending the stopper on the voltage regulator coil. The regulated voltage should be between 14-15 volts at 4000 alternator rpm.
  16.  



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Fig. Fig. 1: Voltage regulator coil adjustment-1970-72



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Fig. Fig. 2: Pilot lamp relay adjustment-1970-72



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Fig. Fig. 3: Voltage valve adjustment-1970-72

1973-77

See Figures 4, 5 and 6

  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 0.024-0.039 in. (0.60-1.00mm).
  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 0.012-0.016 in. (0.30-0.40mm) for 1973-75 models or 0.014-0.018 in. (0.35-0.45mm) for 1976-77 models.
  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 0.032-0.039 in. (0.80-1.00mm) and the point gap adjusted to 0.016-0.024 in. (0.40-0.60mm).
  6.  
  7. The regulated voltage is adjusted by loosening the lock-nut 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.  



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Fig. Fig. 4: Voltage regulator core gap adjustment-1973-77



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Fig. Fig. 5: Voltage regulator coil point gap adjustment-1973-77



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Fig. Fig. 6: Regulated voltage adjustment-1973-77

1978-88

Regulators on these models are not adjustable.



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Fig. Fig. 7: Alternator and Regulator Specifications Chart

 
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