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　　Why don't electric cars screw off? You can see many electric cars every day in road traffic, and don't think that the structure of electric cars is simple, and the scientific and technological content is no easier than that of vehicles. In the after-sales repair shop of electric vehicles, electric vehicles with various phenomena can be touched every day, but some electric vehicles originally have electricity, but they can't walk on by turning the handle after starting. Why? Maybe these four cases.

　　One is the problem that the electric vehicle has electricity and can't go. It may be because the brake turns off the power supply equipment. Those who grasp the electric vehicle understand that many power off maintenance equipment are installed at the brake of the electric vehicle. When the brake pad is rusted, the torsion spring is broken, and the brake pad is damaged, the brake will turn off the power supply and the maintenance equipment will operate. Therefore, the driver can try to replace the brake parts to recover the electric vehicle.

　　The second is to consider whether to speed up the transfer route. Turn the wires into three colors: red, black and blue. The buyer can test the operating voltage of the three wires. If the operating voltage is found to be abnormal, the buyer can also choose to replace the handle or the wire according to the specific situation.

　　The third is the motor problem of electric vehicles, which is also one of the common problems of electric vehicles. Motor faults are also called Hall sensor commutator faults. Generally speaking, the inspection of motor faults is to use a digital multimeter to detect the matching operating voltage of the wire. Assuming that it can be determined that the hall sensor is in trouble, the solution is to remove and replace the sensor.

　　Fourth, there are internal problems with the harness of the electric vehicle. Because some wire harnesses of electric vehicles are exposed to the outside, they will be brittle and eroded by oxidation over a long time. In that way, the electric vehicle will not move when it has electricity. Generally speaking, the additional measurement method of the harness is to separate the skin of the harness and query whether the inner wire is directly oxidized and etched. If the inner wire is directly lost, the harness must be replaced.

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