Do you know the way of connection plug of wire harness?

Do you know the way of connection plug of wire harness?
The wire harness connectors types:

(1) Wiring terminal  
Terminals are mainly for the convenience of the connection wire, terminal is actually a seal inside the insulation plastic pieces of metal, metal plates at both ends are can be inserted into the holes of the wire, there are screws used to tighten or loosen, sometimes need two wire connection, sometimes you need to disconnect, connect them this time can use the terminal, and can be disconnected at any time,  They don't have to be welded together or tangled together, which is easy and quick.  There are many kinds of wiring terminal products, commonly used plug type wiring terminal, PCB type wiring terminal, wiring terminal block, screw fixed wiring terminal, grid type wiring terminal and so on.  
Characteristics of terminal: various pin spacing, flexible wiring mode, suitable for high-density wiring requirements;  The maximum current of terminal is 520 A;  Suitable for SMT production process;  Can be used for reflow welding, the highest temperature up to 300℃;  You can also extend the functionality with different attachments.  
(2) Audio/video plug-in  
(1) Two core, three core plug socket: mainly used to transmit signals between various equipment and as the input plug of microphone input signal.  Two core plug socket is mainly used for mono signal connection, three core plug socket is mainly used for stereo signal connection.  According to its diameter is divided into 2.5 mm, 3.5 mm, 6.5 mm three kinds.  
(2) Lotus plug socket: mainly used in audio equipment and video equipment, it between the two lines as input and output plug.  
(3) Canon plug (XLR): mainly used for the connection between microphone and amplifier.  
(4) Five core socket (DIN): mainly used for the connection between the card recording seat and the amplifier, it can concentrate the stereo input and output signal in a socket.  
⑤RCA plug: RCA plug mainly uses dry equipment towel to see the transmission of signal.  
(3) Rectangular connector  
Rectangular plug and socket are made of different number of contact pairs installed in rectangular plastic shell with better insulation performance.  The number of contact pairs in this kind of plug and socket varies from dozens to dozens.  Arrangement, there are double row, three row, four row, etc.  Due to the elastic deformation of each contact pair, the positive pressure and friction force can guarantee the good contact of the contact pair.  In order to improve the performance, some on the contact pair plated with gold or silver layer.  
Rectangular plug and socket can be divided into pin type and hyperbolic spring type;  With or without a shell;  Locking type and non-locking type, this kind of connector is often used for low frequency and low voltage circuit, high and low frequency mixed circuit, more is used in radio instruments and meters.  
(4) Circular connector  
There are two main types of circular connectors: plug type and screw type.  The plug type is usually used for the circuit connection with frequent plug and plug, few connection points and current not exceeding 1A.  Screw connector commonly known as aviation plug socket, it has a standard rotary locking mechanism, in the case of more contacts and plug force is more convenient to connect, excellent vibration resistance;  At the same time, it is easy to realize waterproof sealing and electric field shielding and other special requirements. It is suitable for the circuit connection with high current and does not need to be regularly plugged and removed.  The number of this type of connection contacts from 2 to nearly 100, rated current from 1 to hundreds of amperes, the working voltage is between 300 to 500 V.  
(5) PCB connector  
Printed board connectors are transitioned from rectangular connectors and should belong to the category of rectangular connectors, but they are generally listed separately as a new type of connectors.  Its contact point from one to dozens of different, can be used with strip connector, or directly with the circuit board plug, widely used in computer host in all kinds of cards and the main board machine connection.  In order to connect the reliable contact is generally gold-plated to enhance its reliability, commonly known as gold finger.  
(6) Other connectors  
Other connectors are integrated circuit sockets, power plug sockets, fiber optic connectors, ribbon cable connectors, etc.