An instructor's manual and student activity guide on auto electrical systems are provided in this set of prevocational education materials which focuses on the vocational area of trade and industry. (This set of materials is one of ninety-two prevocational education sets arranged around a cluster of seven vocational offerings: agriculture, home economics, distributive education, health occupations, world of work, trade and industry, and office occupations.) The instructor's guide is organized into the following elements: title of activity, duration of activity (six to eleven periods), activity goals, fifteen instructional objectives, related vocational clusters, and activity implementation (description, materials needed, safety considerations, teacher preparation prior to class, during the class, follow-up activities, answer key to student check point activities 1 and 2, student question sheet and check sheet to be duplicated). The student activity guide provides step-by-step instructions (narrative and illustrations) for completing each instructional objective (e.g., identify nine tools used for engine tune-up, replace points and condenser on engine mock-up.) At the end of each set of instructions is a student check point (evaluation activity). Occupational descriptions for an automobile mechanic and a service station attendant conclude the document. (JH)