Abnormal Battery Discharging

Any of the following conditions can result in abnormal battery discharging:

1. A faulty or incorrect charging system component. Refer to DIAGNOSIS AND TESTING - ON-BOARD DIAGNOSTIC SYSTEM  for charging system diagnosis and testing procedures.
2. A faulty or incorrect battery. Use Micro 420 tester and refer to Battery System for additional battery diagnosis and testing procedures.
3. A faulty circuit or component causing excessive ignition-off draw.
4. Electrical loads that exceed the output of the charging system. This can be due to equipment installed after manufacture, or repeated short trip use.
5. A faulty or incorrect starting system component. Refer to Starting System for the proper starting system diagnosis and testing procedures.
6. Corroded or loose battery posts and/or terminal clamps.
7. Slow driving speeds (heavy traffic conditions) or prolonged idling, with high-amperage draw systems in use.