Diagnostic Notes

Use the following procedures and specifications in place of the charging system tests in the service manuals.

NOTE:
The alternator output amperage specifications (refer to Alternator/Regulator Test/Part 2 of 2) are lower than the alternator ratings and specifications in the service manuals. This takes into account the effects of temperature on alternator output, and the placement of the Inductive pick-up, which only allows the tester to read the current available to charge the battery, not the current used to operate the ignition and fuel systems.

SYMPTOM

The charge system light is on, or the battery is dead or low.

CORRECTIVE ACTION

Perform the following tests in the order listed.

1. Battery Test (see S/B 88-016, "Battery Test Procedure")

2. Charge System Light Operation

3. Alternator/Regulator Test

4. Parasitic Draw Test