Why does the dashboard needle swing violently when starting the car?

[CarlosRose]

The reason why the dashboard needle swings violently when starting the car is due to a weak battery. The causes of a weak car battery are: 1. Short driving distances leading to insufficient charging; 2. Prolonged use of high-power electrical devices; 3. Unclosed electrical appliances after locking the vehicle; 4. Poor battery quality resulting in insufficient power storage; 5. Short circuit, open circuit between battery poles, or loose connection at the battery terminals; 6. Vehicle leakage. The car dashboard is a device that reflects the working conditions of various vehicle systems, commonly including fuel indicator lights, washer fluid indicator lights, electronic throttle indicator lights, front and rear fog light indicators, and warning lights.