In the process of our daily vehicle maintenance and use, we often need to cut off the power of the battery, such as repairing electrical equipment, replacing the battery, leaving the vehicle idle for a long time, doing body welding, etc. However, this seemingly simple thing may cause damage to the vehicle if it is not operated properly.
It is necessary to turn off the ignition switch before power failure, and turn off electrical equipment, such as audio and other equipment. Sudden power failure is prohibited when electrical equipment is running.
Power off sequence: from the perspective of safety, pull out the negative pole first. It is just the opposite during installation. Install the positive pole first and then the negative pole.
Many people may have this question. My truck is equipped with the main power switch. Do I still need to cut off the battery?
First of all, we should have an understanding of the main power switch. Its common forms are mechanical switches and electromagnetic switches. The forms and control circuits of different vehicles are not the same.
Taking Jinbei light truck as an example, its main power switch is mechanical and installed in series on the negative main grounding wire of the battery. Once the main power switch is disconnected, the power supply of the whole vehicle will also be cut off, and the overall structure is very simple.
With the continuous development of automotive technology, many electronic devices with storage and memory function are more and more widely used in vehicles. If the battery of the vehicle is powered off directly, it may lead to the loss of ECU stored fault information, locking of audio anti-theft password, reset of clock information and other problems, and then bring trouble to the use and maintenance of the vehicle.