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Test H: Charging System Warning Indicator Never/Always On

  1. Turn ignition switch to LOCK position. Remove and inspect fuse No. 15 (7.5-amp) from Central Junction Box (CJB). If fuse is okay, go to next step. If fuse is blown, replace fuse and recheck system operation. If fuse blows again, check for short to ground in Yellow wire between fuse and instrument cluster. Repair as necessary and recheck system operation.
  2. Disconnect generator voltage regulator 3-pin harness connector C121. Turn ignition switch to RUN position. Connect a fused jumper wire between ground and generator voltage regulator harness connector Light Green/Red wire terminal. Observe charging system warning indicator. If warning indicator is not illuminated, go to next step. If warning indicator is illuminated, repair charging system as necessary. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS.
  3. Turn ignition switch to LOCK position. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure voltage between ground and instrument cluster White 10-pin harness connector C288 terminal No. 2 (Yellow wire). See Figure . If more than 10 volts exist, go to next step. If 10 volts or less exist, repair open in Yellow wire between instrument cluster and fuse panel. Recheck system operation.
  4. Turn ignition switch to LOCK position. Measure resistance of Light Green/Red wire between instrument cluster White 10-pin harness connector C288 terminal No. 3 and generator voltage regulator harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Light Green/Red wire between instrument cluster and generator voltage regulator. Recheck system operation.
  5. Check continuity between terminals of charging system warning indicator bulb. If continuity exists, replace instrument cluster printed circuit. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. Recheck system operation. If continuity does not exist, replace bulb. Check system for normal operation.
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