This student guide is for Unit 2, Charging System, in the Engine Tune-Up Service portion of the Automotive Mechanics Curriculum. It deals with how to test the charging system. A companion review exercise book and posttests are available separately as CE 031 209-210. An introduction tells how this unit fits into the total tune-up service, defines new terms, and provides work activities on the introductory information. Three performance objectives are covered: inspect, adjust, or replace fan belt (alternator belt); evaluate alternator and regulator output; and remove and install an alternator. Each objective is addressed in a separate section that includes these materials: introduction to the performance objective, performance checklist, list of tools and equipment needed to do the work activities for this performance objective, reading list, information sheets, and work activities that give hands-on practice in doing one part of the performance objective. (A charging system Graphic Diagnosis Chart is appended.) (YLB)