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Home >> Buick >> 1990 >> Estate Wagon >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Tests >> Alternator Warning Light

Alternator Warning Light

  1. Visually check alternator belt and wiring. On models without charge light, proceed to UNDER OR OVERCHARGED BATTERY  . On models with charge light, proceed to step 2).
  2. Turn ignition switch to the ON position (engine not running). Charge light should come on. If charge light is not on, disconnect alternator harness connector at alternator. Using a jumper wire, connect one end of jumper wire to alternator harness connector terminal "L". Connect the other end to ground. If charge light comes on, repair or replace alternator.
  3. If charge light did not come on in step 2) with jumper wire connected, locate open circuit between grounding lead and ignition switch. Charge light may be open. If charge light was on in step 2), go to next step.
  4. Start engine and run at moderate speed. Charge light should go off. If charge light stays on, disconnect alternator wiring connector. If light goes off, repair or replace alternator. If light stays on, check for grounded wire to alternator wiring connector terminal "L".