Normal Operation: Notes

The generator is belt-driven by the engine accessory drive system. There are many sources of generator noise. The noise could be from the generator bearing, belt pulley misalignment and/or electrical noise. A generator with certain types of diode or stator failures may also produce an audible noise.

This pinpoint test is intended to diagnose the following: 

• Accessory drive belt
• Loose bolts/brackets
• Generator/pulley