This book describes the purpose, design and principle of operation of electrical equipment devices for tractors, combines and cars; the technical characteristics of these devices are given. It covers the most typical malfunctions that occur in devices during the operation of machines, indicates the technical means for determining malfunctions and methods for their elimination directly in repair shops and farms. This manual describes in detail the schematic diagrams of the electrical equipment of modern tractors and cars. The procedure for maintenance of devices and safety rules when working with them are described. The book is designed for tractor drivers, combine harvesters, mechanics of repair shops and other agricultural machine operators.