The function of car fuse is to cut off the power supply when the electric equipment on the vehicle is short-circuited or overloaded, and play a role in protecting other electrical appliances and lines It is only a protection program to avoid greater losses. It can prevent vehicle damage and fire after short circuit, but it cannot predict and prevent short circuit from happening.
Relay is also a part of a protection circuit. Its function is to control large current with small current. For example, some electrical appliances on the car have high power. When working, the current is very large. If the switch is directly controlled, the switch volume will be too large and too complex. Therefore, the relay method is adopted. Use a small power switch to control the relay and then the relay controls the high power electrical appliances.
A:Precautions for fuse replacement:
1 .To replace the car fuse of the same specification If you use a small current, it will break soon. If you use a large current, the fuse of the car will not break easily when a short circuit occurs, which will easily lead to fire Pay attention to the ampere value mark at the top of the fuse when disassembling and assembling If the fuse burns out and the ampere value is unrecognizable, we can also judge by its color. International standard: 2A gray, 3A purple, 4A pink, 5A orange, 7.5 A brown, 10A red, 15A blue, 20A yellow, 25A colorless and transparent, 30A green, 40A deep orange .
2.Sit in the right place
There are many fuses in the fuse box because there are many optional equipment lines reserved on the car, so there are many empty positions on the fuse box. If the fuse is inserted in the empty position, it will not work at all. You should carefully check the electrical appliances on the fuse box before installing it.
B. Location of car fuse box:
The fuse box of general models is next to the engine and in front of the steering wheel. Open the machine cover and you can see it .
The location of the fuse box varies from car model to car model: the common one is in the lower left corner of the steering wheel, the other is in the negative driving side, the trunk of the miscellaneous box and the engine compartment .
The blown fuse is generally invisible to the naked eye and needs to be detected by an electric pen Generally speaking, if the car fuse is broken, some parts of the car can't work normally, so when a certain part of the car is abnormal, don't ignore it easily and check it in time, especially the hidden danger of the car fuse is big.
C:Those behaviors will impose a huge burden on the automobile circuit
1.flush the engine compartment directly with water
In order to make the engine cleaner, flushing the engine compartment directly with water can easily cause short circuit of the circuit and cause the car fuse to blow
2.Modified car lights
In recent years, headlights have been upgraded rapidly. Many car owners think that their headlights are not bright enough, and many of them have changed to high-power headlights If the power of the modified headlights is too high, the car will easily cause damage to the car fuse
3.Modified sound box
Excessive pursuit of sound effects to modify sound is not surprising Like headlights, if the power of the modified speaker is too high, it is easy to cause damage to the car fuse.
4 .Wrong use of cigarette lighter
Now many devices use cigarette lighter as power, just like chargers. Generally, low-power devices are no problem, but be careful not to use high-power devices to avoid fusing.

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