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Home >> Geo >> 1991 >> Storm Base, 2D Hatchback, Standard >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Testing >> Alternator Warning Light
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Alternator Warning Light

  1. Visually check alternator belt and wiring. Turn ignition switch to RUN position (engine not running). Charge light should come on. If charge light comes on, go to step 3). If charge light does not come on, disconnect alternator harness connector at alternator. Using a fused-jumper wire, connect one end of jumper wire to alternator harness connector terminal "L" and other end to ground.
  2. If charge light comes on when jumper wire is connected, replace alternator. If charge light does not come, locate open between terminal "L lead and ignition switch. Charge light may be burned out.
  3. Start engine and run at moderate speed. Charge light should go off. If charge light stays on, disconnect alternator wiring harness connector. Remove heater and A/C relay from fuse box. On models with automatic transmission, disconnect shift lock control module.
  4. Turn ignition on. If charge light lights, repair short between instrument cluster, fuse box, shift control module and alternator. If charge light goes off, replace alternator. Reconnect shift lock control module. Charge light should go out. If charge light goes on, replace shift lock control module.