On the Volvo S40 car, as well as on all modern cars the scheme of electric equipment with tension of 12 V, with the generator tension regulator is used. The scheme of electric equipment is executed on unipolar system in which the body and the engine are used as a minus wire ("weight"). The general characteristic of various devices of electric equipment is given in tab. 2.3
, and the list of the applied lamps in fig. 2.48
and in tab. 2.4.