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Indicator Always On

  1. Run engine at idle. Measure system voltage at battery. If voltage is more than 16.5 volts or less than 11.2 volts, repair charging system. If voltage is 11.2-16.5 volts, go to next step.
  2. Check for Powertrain Control Module (PCM) diagnostic trouble codes in regard to charging system, oil pressure or engine temperature. See appropriate TESTS W/CODES article in ENGINE PERFORMANCE section. Refer to menu below. Ensure cooling system and oil pressure are within specification. See COOLING SYSTEM & OIL PRESSURE SPECIFICATIONS  .
  3. If cooling system and oil pressure are not to specification, repair appropriate system as necessary. If cooling system and oil pressure are to specification, check for open circuit or poor connection in Red wire between Instrument Panel Cluster (IPC) connector terminal C12 and alternator. If circuit is open, alternator will not generate voltage and vehicle may be operating only on battery power. If circuit is okay, replace IPC.
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