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Home >> Hummer >> 2009 >> H3 Base, Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC B1420 >> Circuit/System Verification

Circuit/System Verification

  1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6V and 15.0V.
  2. Observe the scan tool BCM Battery Voltage parameter. The reading should be between 12.6V and 15.0V.