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The automotive wiring harness is the main body of the circuit of the automobile. Without the wiring harness, there is no automobile circuit. It is always one of the important factors affecting the comfort and practicability of high-heavy-duty truck interior harnesses . In order to better improve the quality of products, since 2011, Sinotruk truck shares body factory has received market feedback. , multiple investigations, on-site confirmation, and cause analysis, focused on the establishment of a high-level electrical wiring harness installation problem research group, from the marketing department, the assembly line, to the body factory, followed by investigation, in-depth and persuasive problems root. 
After detailed and meticulous observation and research, the heavy-duty truck company found that the biggest problems are likely to appear in the air horns, the front high lights, the top lining gated switch harnesses, and the miscellaneous box frontier feeders. In the market, it often annoys users and seriously affects the overall quality of CNHTC products. For this reason, Sinotruk Truck Body Co., Ltd. has determined that we must completely eradicate the problem and guarantee that such a timelessness will not occur. 
First of all, the workers of the Auto Industry Plant found that when the operator pre-cuts the wire harness, it is easy to cause damage to the wire harness. After discussion and verification, the team member actively boldly increases the length of the wire harness. This improvement is recognized by the on-site operator. The feedback was completely convenient for the interior assembly and was approved by the CNHTC Technical Center. The drawings were officially revised at the end of March 2011.
Secondly, the heavy automobile body plant is also at the terminals of the cable feed line, adding a length mark along the direction of the wire harness. This mark not only facilitates the on-site operator's control of the assembly accuracy, but also limits the pull-band and the feed line limit in the miscellaneous goods box. Intensive tying, fully realized the perfect fixing scheme of the feeder line of the top cable harness, and has been verified and approved by the CNHTC.
Once again, the Automakers Plant actively contacted the manufacturer to confirm the quality status of the top lining switch control wiring harness, and reported to the Ministry of Technology to unify the tying method of this part through further communication with the manufacturer. At the same time, it also dispatched someone to coordinate on-site at the assembly line to confirm the reserved length of the left and right gate control switch lines, and formulated a unified standard for enhancing the quality of the process.
Finally, after the repeated inspection and verification of the air horns by the Automakers Plant, the research team successfully strengthened the process by adding wire harness fixing plates to the inner wall of the top cover, successfully solving these problems at one stroke. Through repeated strengthening and aging tests, the research team successively made The most suitable fixed board, after relevant process verification and mass improvement, the actual installation and use effect is very good.
After two months of continuous testing, China National Heavy Truck Trucks Co., Ltd. has not received any feedback on the quality of high-end electrical wiring harnesses. At the same time, the strengthening process of high-end electrical wiring harnesses was officially incorporated into the China National Heavy Duty Truck assembly. Department, General Assembly Department II, and body factory's "Assembly Inspection Operation Instructions."
Extensive reading:
The wire harness refers to a component that is formed by crimping a contact piece terminal (connector) made of copper material with a wire and cable, and then remolding an insulator or an external metal shell, and forming a connection circuit by bundling a wire harness. The wires in the automotive wiring harness are commonly used in specifications with nominal cross-sectional areas of 0.5, 0.75, 1.0, 1.5, 2.0, 2.5, 4.0, 6.0, and other square millimeters of wire, each of which has a permissible load current value for use with different power consumption devices. The wire. Take the vehicle wiring harness as an example, the 0.5 specification line is suitable for instrument lamps, indicator lamps, door lamps, ceiling lamps, etc.; 0.75 specification line is suitable for license plate lamps, front and rear small lamps, brake lamps, etc.; 1.0 specification line is applicable to the steering lamp and fog Lamps, etc.; 1.5 specification lines are suitable for headlights, horns, etc.; main power lines such as generator armature lines, ground lines, etc. require 2.5 to 4 square millimeters of wire. This just refers to the general car, the key depends on the load of the maximum current value, such as the battery's ground wire, the positive power cord is a dedicated car wire alone, their wire diameter are relatively large, at least a dozen square millimeters Above, these "giant" wires will not be incorporated into the main harness.