The car connection line generally adopts a single line, the electrical equipment is connected in parallel, and the negative pole is grounded. The lines are distinguished by lines of different colors and numbers, and the ignition switch is divided into several main lines as the center. Let's explain the rules!

1. Battery positive wire:

The car connection wire can be directly led from the battery to the fuse box, or directly from the positive wire of the battery to the start terminal, where the thin positive wire is led to other circuits.

2. Ignition, instrumentation, light lines:

The circuit must be connected through the car key.

3. Dedicated line:

No matter how the engine works, the electrical equipment that needs to be connected, such as the cigarette lighter of the tape recorder, etc., is equipped with a single-stage ignition switch for power supply.

4. Start the control line:

The control switch (touch screen) that activates the main circuit by the car connection line is often turned on and off by a magnetic switch. There are three wiring methods. The electromagnetic switch of the low-power starter has an attracting coil and holding coil controlled by the starting range of the ignition switch. The pull-in and holding coil of the high-power starter is controlled by the starter relay (Dongfeng Jiefang, Mitsubishi heavy-duty vehicles, etc.); in vehicles with automatic transmissions, in order to ensure neutral start, the start control line is often connected in series with the neutral switch.

5. Turnout:

The car connecting line nodes are distributed on the whole body of the car and connected with different metals. For example, iron, copper and aluminum, aluminum and iron form electrode potential differences, and some nodes are easily polluted by mud, oil, rust, etc. Some nodes are thin metal sheets, and the indicator light is not on, which may cause failures such as the instrument not working and the speaker not making sound. Therefore, some cars use double-deck switches.

Power System Wiring Rules

1. The generator must be connected in parallel with the battery, and the negative pole of the battery must be grounded.

2. There is a logo or name next to the terminal of the domestic silicon rectifier generator

3. Alternator with built-in regulator

Starting System Wiring Rules

1. The ignition switch directly controls the starter circuit:

The ignition switch directly controls the pull-in and holding coil of the engine through the starting gear, and is mostly used in the automotive circuit of the engine below 1.2KW; the current of the electromagnetic switch coil of the starter motor above 1.5KW is above 40A, and the contact of the starter relay is used as a switch.

2. Starter control circuit with start protection:

When the ignition switch of the starter is set to 0, the circuit is completely disconnected.

When the ignition switch is in the second gear, in addition to the above circuit, the starter relay circuit is also connected. Battery positive pole-ammeter-ignition switch-starter relay coil-relay normally closed contact 3354 is connected with-battery negative pole 3354 starter drive body. At the same time, the electric bridge connects the bypass contact of the ignition coil, the current passes through the primary side of the ignition coil, and the additional resistance is cut off. After the engine is ignited, the voltage between the neutral point n of the generator and the ground (the regulated voltage of the generator is about 0.5°C) opens the normally closed contact of the start protection relay, cuts off the charging lamp and passes through this point, the charging lamp goes out, indicating that the generator is working normally . In addition, the brake circuit to the starter relay coil is also cut off. When the generator is working normally, even if the ignition switch is turned to the second gear by mistake, the starter will not mesh with the flywheel, and the flywheel ring and starter will not be damaged. 4. Ignition system wiring rules

Automobile ignition systems can be divided into traditional "contact" ignition systems, non-contact ignition systems and computer-controlled ignition systems. In some cases, the piston of a certain cylinder is at a certain angle before the compression top dead center) - self-induced electromotive force in the primary coil (about 300V) - secondary coil mutual induction to generate high pulse voltage (6000~30000V).

Lighting system wiring rules

Automotive lighting systems generally consist of headlights, position lights, tail lights, license plates, instrument lights, and interior lights. The headlights are divided into high beams and low beams, controlled by a dimmer switch.

Lighting is controlled by light switches. The light switch is turned off at position 0, the small lights at position 1 (including direction indicators 1,032 / 5,000Tors, tail lights, instrument lights, license plate lights), and position 2 is for the headlights and small lights to be on at the same time. The current of the lighting system generally comes from the battery positive terminal, which is not controlled by the ignition switch. (Due to the high power of the headlight, the on-off is usually controlled by the light relay, and the second gear of the switch is used to control the relay coil). A way to turn on a button for a short period of time.

Modern automotive lighting systems are often centrally controlled by a combination switch, which is mostly installed on the steering wheel column, located on the lower side of the steering wheel, and the driver can ignore the steering wheel when operating.

The above is the description of the characteristics and rules of the car connection line. If you want to know more, please feel free to contact us!