The main function of the safe wire is to quickly fuse when the circuit current is too large and exceed the rated current value of the safe wire, cut off the power supply of the electrical equipment, and protect the circuit and prevent the further expansion of electrical faults. I have encountered the following problems: for example, the headlights do not turn on, the sound does not respond, the sunroof cannot be closed, and the cooling fan does not turn. Lack of understanding of electrical specifications, the selection of higher-power electrical appliances in the process of modification, or the formation of circuit faults due to irregular wiring, the probability of safe wire faults caused by this situation will greatly increase.

1. Where is the safe silk hiding? 1. Engine compartment safety box: mainly responsible for managing external electrical appliances, such as engine control unit, horn, glass washer, ABS, headlights, etc. In this safety box, in addition to safety wires, various relays are installed. Such as headlights, engine,...

2. Why does the secure wire burn out? 1. Many car owners want to improve the brightness of the headlights, choose a higher-power bulb, or choose a higher-power light modification. Too many auxiliary equipments lead to excessive current on the same line. 3. Too many electrical equipments are installed, and the modified wiring is not tightly packaged, which is easy to cause interface oxidation. The circuit is short-circuited and the connector is too wet, which will cause oxidation of the connector for a long time, and there is a danger of spontaneous combustion. 5. The aging of the wire rubber and the exposed metal wire form a short circuit; when cleaning the car, pay attention to avoid touching the buried floor as much as possible. 6. A high-power double-cylinder electric air pump was purchased, and the electric air pump was mistakenly connected to the cigarette lighter interface. Depending on the model, the safe wire current of the cigarette lighter of some models is only 15A, while a single high-power cigarette lighter has only 15A. The electric double-cylinder air pump has a current of more than 20 amps.

3. The method of judging the burnout of the safe wire, 1. Intuitive judgment with the naked eye: most of them can be judged by an intuitive method. As shown in the figure, you only need to see that the melt between the two inserts of the safe wire has been disconnected and needs to be replaced. Resistance file measurement: Some safety wire materials are not well used, lack of transparency, or the surface of the safety wire is worn, we can use a multimeter resistance file for detection.

4. The general idea of ​​replacing the safety wire: 1. The combination of faults is reflected, the difference is that the engine cabin safety box is the cab safety box fault. 2. Find a suitable spare safety wire in the safety box to replace, 3 . When there is no safety wire on hand, the safety wire that is not necessarily used during driving can be removed and temporarily replaced by the damaged safety wire. For example, the sunroof and wiper safety wire are temporarily unnecessary. 4. When there is no suitable safety wire to replace, temporarily replace the damaged safety wire with the safety wire with a slightly larger current value, such as 10A instead of 7.5A, 15A instead of 10A, but the original safety wire standard must be restored as soon as possible after parking. Note: General In other words, the same model will use the same safety wire, so that the same safety wire clip can be used, and the spare safety wire is generally placed in the engine compartment safety wire box.

5. Next is an example of the inspection and replacement of the F3 safe silk fault: the story is as follows: use the electric air pump to connect the trachea to measure the air pressure and directly press the start button, because the back pressure of the air pump is too large to start (stuck) Steady wire burnt. Because the electric current of the electric air pump is relatively large, the correct operation method is to press the open air button and wait for the air pressure to drop, and then press the air pump start button. It may be necessary to connect directly to the battery to start the electric air pump. ①Analysis: The safety wire of the cigarette lighter should be in the safety box of the cab. ②Pry open the storage box on the side of the cab with a screwdriver in the direction shown in the figure. ③Remove the safety wire box cover, there are very clear safety wire explanations in Chinese, just search according to the order in the picture, and quickly locate the cigarette lighter safety wire, ④Use your own safety wire The clip removes the safety wire of the cigarette lighter for visual inspection, and the safety wire has been blown. ⑤Because the spare safety wire is not in the cab safety box, please open the engine compartment cover, find the cab safety wire box as shown in the figure, and open the safety wire box. ⑥Turn over the cover of the safe wire box, we will clearly see the standard and installation orientation of the safe wire, among which the spare safe wire is clearly marked, generally there are three standards of 10A15A20A, ⑦Because the current standard of the cigarette lighter is 15A, We successfully found the light blue 15A spare safety wire to replace and returned to normal.