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Home >> Geo >> 1990 >> Storm Base, Standard >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Testing >> Alternator Warning Light

Alternator Warning Light

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