Developed as part of a competency-based curriculum in automotive mechanics which is usable by students at both the secondary and postsecondary levels, this learning package focuses on automotive electrical systems. It is the first unit to be published in a series of eight which will cover the eight subject areas on the national certification examination for auto mechanics. Following an introduction to the fundamentals of electricity and magnetism, this manual explains the identification, testing, and servicing of (1) automotive batteries, (2) the charging system, (3) the cranking circuit, (4) the ignition system, and (5) the electrical lighting and wiring of the body and chassis. Each unit contains lists of textbook references, of tools and materials needed, and of specific objectives, as well as a competency checklist for student use. Information sheets are provided with detailed diagrams, illustrations, and photographs. On the worksheets in each unit, students are asked to answer written questions or to demonstrate manually their achievement of the objectives. Tests are also provided at the conclusion of some of the units. (ELG)