Know Auto Repair Principles

The frequency of inspection is determined largely by operating conditions. high-speed operation, high temperatures, and dust and dirt increase the wear on brushes, slip rings, and bearings. At regular intervals, inspect the terminals for corrosion and loose connections and the wiring for frayed insulation. Check the mounting holes for tightness, and the belt for alignment, proper tension, and wear. Belt tension should be adjusted according to the recommendations of the engine or vehicle manufacturer. When increasing belt tension, apply pressure against the stator laminations between the end frames, not against either end frame.

Noise from the alternator may be caused by worn or dirty bearings, loose mounting bolts, a loose drive pulley, a defective diode, or a defective stator.