PINPOINT TEST F : GENERATOR NOISE or MECHANICAL PERFORMANCE: Notes

Diagnostic Overview 

Diagnostics in this information assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in Service Information for more information.

Refer to Charging System for schematic and connector information.

Normal Operation and Fault Conditions 

The generator is belt-driven by the engine accessory drive system. There are several sources of generator noise which include bearing noise, electrical fault noise, generator or belt pulley misalignment. A generator with certain types of diode or stator failures may also produce an audible noise.

Visual Inspection and Diagnostic Pre-checks 

Before diagnosing or repairing the charging system inspect the following items:

• Fusible links
• Wiring, terminals or connectors
• High current BJB for loose or corroded connections

This pinpoint test is intended to diagnose the following: 

• FEAD belt
• Loose bolts/brackets
• Generator/pulleys