Installing wiring harnesses on the body of a VAZ-2123 car
When repairing the electrical equipment of a car, sometimes you have to check all the wiring
To do this, you need to imagine how it runs along the body. All the wiring is mainly hidden under the trim and under the trim panels.
You can see how it runs on the harness diagrams.
These diagrams can also be very helpful when transferring electrical harnesses from body to body when it is necessary to change the body.
Basically, the wiring of all cars is divided into three main parts.
This is the engine wiring harness, or it is also called the front harness.
The rear harness is the car interior harness. And the instrument panel harness.
Additional harnesses include door wiring harnesses and other harnesses.
Depending on the current strength, wires of different cross-sections are used in harnesses.
The strongest wires are at the connection of the battery with the starter and generator.
Special high-voltage wires are used in the ignition system, which can withstand voltage up to 40,000 volts.
The front harness of the engine compartment includes three harnesses. The harness connecting the battery with the starter and generator unit.
The harness of the control and monitoring system of the power plant. And the lighting, alarm and windshield wiper harness.
The rear harness serves the alarm and lighting systems of the rear lights, interior lights, fuel module, etc.
All harnesses are connected to each other in a common circuit using junction blocks.
Since the car system has a single-wire circuit, the negative wire of the wiring harnesses is attached to the car body.
As a rule, the negative wire has black insulation.
When installing or checking electrical connections, it is imperative to pay attention to the connection of the ground wire.
In many cases, due to oxidation of the contact, one or another malfunction in the electrical system occurs.
The figures below show the layout of the wiring harnesses of the VAZ-2123 car.
Ignition wire harness 2123-3724026-80; Front 2123-3724010-50; connecting battery and starter 2123-3724070
