1990 Nissan 240SX Alternator & Regulator

Exploded view of the Hitachi alternator. Courtesy of Nissan Motor Co., USA. Wiring Diagrams. See appropriate chassis wiring diagram DIAGRAMS ..

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1990 Nissan 240SX

1990-91 ELECTRICAL
Alternators & Regulators – Hitachi
1990 Axxess, Pulsar NX
1991 Maxima, NX, Pathfinder, Pickup, Sentra, Stanza, 240SX & 300ZX
NOTE: Some models are available with Mitsubishi alternators. See appropriate ALTERNATOR & REGULATOR – MITSUBISHI article.
DESCRIPTION
Hitachi alternators are conventional 3-phase, self-rectifying alternators. See Fig. 3. Three positive and 3 negative diodes are used to rectify current. All models are equipped with Integrated Circuit (IC) voltage regulators. A diode on the charge indicator light circuit monitors alternating voltage at the stator. Charge indicator light remains off when monitored voltage and charging voltage are equal.
TROUBLE SHOOTING
CHARGING SYSTEM
TROUBLE SHOOTING NO START CONDITION

  • Dead Battery : Check/Replace Battery
  • Bad Cable Connections : Clean/Replace Cables
  • Ignition Switch/Circuit Fault : Check Switch/Circuit

TROUBLE SHOOTING CHARGING SYSTEM WARNING LIGHT STAYS ON

  • Loose/Worn Alternator Belt : Tighten/Replace Belt
  • Loose Alternator Connections : Check/Repair Connections
  • Warning Light Wiring : Check/Repair Wiring
  • Faulty Stator/Diodes : Test/Repair Alternator
  • Faulty Voltage Regulator : Test/Repair Regulator

TROUBLE SHOOTING WARNING LIGHT OFF WITH IGNITION SWITCH ON

  • Blown Fuse : Check/Replace Fuse
  • Faulty Alternator : Test Alternator
  • Bad Warning Light Bulb : Test/Replace Bulb

TROUBLE SHOOTING WARNING LIGHT ON WITH IGNITION SWITCH OFF

  • Alternator Wiring Short : Check/Repair Wiring
  • Faulty Rectifier Bridge : Test/Repair Alternato
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