Initial Inspection and Diagnostic Overview

NOTE: Before performing charging system tests on the vehicle, note the concern such as: slow cranking, battery discharged, indicator lamp on. This information will aid in isolating the part of the system causing the symptom.

Test for current drain. Drain Testing
Following are some of the most common current drain problems:
1. Interior lamp stays on constantly.
2. Electronic component malfunctions.

NOTE: Only test the charging system with a fully charged, properly operating battery. Make sure cable connections are clean and secure. Check the testing equipment and instructions.

Perform a visual inspection using the following procedure:
1. Check the fuse link located between the power distribution box and harness and the Generator (GEN). Replace the fuse link if burned.
2. Check battery posts and battery cable terminals for clean and tight connections. Remove the battery cables (if corroded), clean and install them securely.
3. Check for clean and tight wiring connections at the generator, Voltage Regulator (VR) and engine.
4. Check the drive belt tension.
5. Check battery state of charge. Battery Capacity Test

Isolating the Concern
Isolate the battery, the charging system, and the electrical circuits to correctly identify the area where the difficulty lies. Open circuits or other wiring concerns can prevent the Generator (GEN) from operating normally.

Generator Check
Check the Generator (GEN) to see if it is producing the proper output current and voltage. Refer to Component Tests. Component Tests and General Diagnostics If the generator does not meet specifications, use the symptom chart to determine the correct test procedure for troubleshooting the charging system. Symptom Related Diagnostic Procedures