Initial Inspection and Diagnostic Overview

When the ignition switch is turned to the ON position, battery potential will register on the Voltmeter. During engine cranking a lower Voltage will appear on the meter. With the engine running, a Voltage reading higher than the first reading (ignition in ON) should register.
The following are possible symptoms of a charging system fault:
- The Voltmeter does not operate properly
- An undercharged or overcharged battery condition occurs.
Remember that an undercharged battery is often caused by:
- Accessories being left on with the engine not running
- A faulty or improperly adjusted switch that allows a lamp to stay on. See Ignition-Off Draw Test - Battery for more information.

The following procedures may be used to correct a problem diagnosed as a charging system fault.

1. Inspect condition of battery cable terminals, battery posts, connections at engine block, starter solenoid and relay. They should be clean and tight. Repair as required.
2. Inspect all fuses in the fuse block module and Power Distribution Center (PDC) for tightness in receptacles. They should be properly installed and tight. Repair or replace as required.
3. Inspect the electrolyte level in the battery Replace battery if electrolyte level is low.
4. Inspect generator mounting bolts for tightness. Replace or tighten bolts if required. Refer to the Generator Removal/Installation for torque specifications.
5. Inspect generator drive belt condition and tension. Tighten or replace belt as required.
6. Inspect automatic belt tensioner (if equipped).
7. Inspect connections at generator field, battery output, and ground terminals. Also check ground connection at engine. They should all be clean and tight. Repair as required.