Here's why:
* Safety First: Disconnecting the negative cable reduces the risk of accidental electrical shock. If you accidentally touch a live wire while working, the current will have to flow through the chassis, which is grounded, to reach the battery. This path is generally of higher resistance, which can reduce the severity of the shock.
* Preventing Damage: Disconnecting the negative cable prevents accidental short circuits that could damage electrical components.
* Working on the Positive Terminal: If you need to work on the positive terminal, disconnecting the negative cable will ensure that the terminal is completely de-energized.
Important Note:
* Never disconnect both the positive and negative cables at the same time. This can create a dangerous situation where current can flow through the vehicle's body and chassis.
* Always make sure the vehicle is parked on a level surface and the parking brake is engaged before disconnecting any battery cables.
Remember, safety is paramount. Always take the necessary precautions when working on your vehicle's electrical system. If you are unsure about any part of the process, consult a qualified mechanic.
