Vehicle electrical system construction

The car’s on-board network is a car’s power supply network that unites sources and consumers of electricity.

Vehicle electrical system

Cars and motorcycles are used an on-board DC network. Sources of electricity in the on-board network are a generator and a storage battery (battery).

Table of Contents

The main car electricity consumers:

  • Storage battery by the charging;
  • Field Generator ;
  • Car Ignition system;
  • Headlights and sidelights of a car;
  • Alarm;
  • Fans, heated seats and windows;
  • Car`s audio system;
  • Switching, distribution and protective devices;
  • Fuse holder;
  • Buttons, switches and switches, relays;
  • Switching and power blocks;
  • Car wiring;

Electrical wiring

Electrical wiring consists of stranded copper wires with different cross-sections, with special plastic insulation. Wiring is collected in bundles and laid on the body in special holes. For fastening electrical wiring use electrical tape, clamps and clips. In the engine compartment, the electrical wiring is assembled in corrugated or molded plastic tubes. For convenience and difference, automotive wiring varies in color of insulation depending on the belonging to specific devices. Color coding is done to improve troubleshooting and simplify vehicle maintenance. Marking is applied by the manufacturer.


Harnesses, devices and blocks are connected by special plastic multi-pin connectors.

On-board DC voltage: 12 V and 24 V:

12 V – voltage on-board network uses on all modern passenger cars.

24 V – uses on heavy trucks.

Author: delfi

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