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Battery Undercharged Or Overcharged

NOTE: For proper wiring colors and identification of terminals, see appropriate wiring diagram. See WIRING DIAGRAMS  .
  1. Disconnect generator connector. Turn ignition on. Check voltage at harness connector terminal "L" (Red wire on Cutlass and Malibu 2.4L and all V-6 models, and Brown wire on all other models with 2.4L). If battery voltage exists, go to next step. If battery voltage does not exist, go to step  5 .
  2. Check voltage at BAT terminal of generator. If battery voltage exists, go to next step. If battery voltage does not exist, go to step  8 .
  3. Reconnect generator connector. Start engine and run at 2000 RPM. Ensure all accessories are off. Check battery voltage. If voltage is 13-16 volts, go to step  9 . If voltage is not 13-16 volts, go to next step.
  4. Bench test generator. If voltage is 13-16 volts, go to step  9 . If voltage is not 13-16 volts, go to step  10 .
  5. Using voltmeter, backprobe instrument panel connector terminal No. 25 (Brown wire). If battery voltage exists, go to step  11 . If battery voltage does not exist, go to next step.
  6. Using voltmeter, backprobe instrument panel connector terminal No. 28 (Pink wire). If battery voltage exists, go to step  12 . If battery voltage does not exist, go to next step.
  7. Repair open circuit between fuse block and instrument panel connector terminal (Pink wire). Retest system.
  8. Repair open circuit between battery and generator terminal BATT (Red Wire). Retest system.
  9. Load test battery. Recharge or replace as needed. Retest system.
  10. Replace generator. See GENERATOR  under REMOVAL & INSTALLATION. Retest system.
  11. Repair open circuit between generator and instrument panel connector terminal No. 25 (Brown wire). Retest system.
  12. Open circuit exists in instrument panel. Replace instrument panel. Retest system.
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