Designed as part of a 40-hour course in minor electrical home repairs, this 50-minute lesson is designed to enable the student to: (1) use a voltage tester to isolate electrical switching problems safely; (2) use simple hand tools to remove the defective switch without creating a shock hazard; (3) correctly identify the type of wire, current, voltage rating, and amperage limitation for the new switch from the information found on the defective switch; (4) use a continuity tester to test the new switch for proper operation before installation; and (5) install the new switch legally and test the circuit safely. The lesson plan includes information on the course for which the lesson was desinged; equipment and audiovisual aids needed; requirements for student materials; course objectives; bibliographic references; and special remarks for the instructor. Next, a step-by-step outline of the instructor's presentation is provided in a format indicating the length of time and the equipment or other aids necessary for each step of the lesson. Transparency masters are included. (PAA)