The most common additional equipment is an audio system consisting of a CD player, DVD player or radio with a set of speakers. The audio system can also be supplemented with a power amplifier.
Warning! During the warranty period, independent installation of additional equipment on the vehicle, or installation of equipment not provided by the manufacturer, may be grounds for denial of free warranty repair.
Sometimes the standard vehicle electrical connectors are not suitable when installing non-standard equipment. In many cases, such as installing CD players, audio amplifiers and other audio equipment not provided by the manufacturer, this problem can be easily solved. The fact is that audio equipment manufacturers also adhere to standard connection blocks (at least maintaining a uniform standard for their mass production). It is enough to purchase an adapter with the appropriate connecting blocks. For common car models, such adapters are produced by both audio equipment manufacturers themselves and third-party manufacturers. Difficulty may arise only with connection of rare Hi-end class equipment. But for such equipment, as a rule, it is necessary to lay its own electrical wiring, separate from the vehicle's on-board circuit (this kind of work should be entrusted to specialists).
When installing most of the various electrical devices that are available on the market on a car (security alarm, anti-radar, navigator, parking sensors, video recorder, etc.) it is not possible to use a standard connector. They are simply not on the car. Intervention into the standard electrical circuit of a vehicle is in most cases limited to supplying power to the new device. Additional devices, even those consisting of several separate elements, are equipped with wires with corresponding connecting blocks and do not require any radical changes to the standard wiring. The greatest intervention in the electrical circuit of the car is performed during the installation of the security system (the electrical circuits of the engine control system devices are broken, and more often the corresponding wires are simply cut). By means of additional wires, switching or blocking devices are built into the gaps. In this case, it is necessary to make the most hidden connection of the wires, without disturbing the appearance of the factory wiring harnesses. For these purposes, the most suitable connection is using couplings (see "Wiring repair"). Such a connection can be easily hidden again in the braid of the harness. It is necessary to avoid twisting wires in important circuits (where a contact failure can lead to engine shutdown, de-energization of devices and vehicle components that affect traffic safety).

Where there is no need to hide the wiring, it is convenient to connect the wires using special connectors.
No tools are required for their installation. The connectors are designed for standard wires used in vehicle wiring.
Sequence of execution
1. Prepare the car for work and remove the wire terminal from the negative terminal of the battery (see "Preparing the car for maintenance and repair").
2. We direct the wire of the car's electrical circuit, to which we will connect the additional device, into the connector slot so that the free hole in the end of the connector (indicated by an arrow in the photo) was directed towards the wire being connected. We put the connector on the wire.

Note: When selecting a circuit for connecting power to additional equipment, you should be guided by the power of these devices and the current strength of the fuse that protects this circuit. The instructions for the equipment being installed usually provide recommendations on where to supply power to the device.
3. Insert the end of the connected wire into the free hole of the connector.

4. Turn the connector cover towards the metal jumper and press until it snaps into place.

Note: The jumper cuts the insulation off the wires and shorts them out, and the cover compresses the parts of the connector, securely fixing the wires in it. Additional insulation is not required for such a connection. If the force of your fingers is not enough to snap the connector cover into place, you can first press the jumper with pliers or side cutters.

