Removing the battery or disconnecting the terminals (usually the negative first). Why?

When disconnecting a car battery, it is recommended to remove the negative terminal first for safety reasons. Here’s why: 1. **Safety**: The negative terminal is typically connected to the vehicle's chassis (ground). By disconnecting the negative terminal first, you reduce the risk of a short circuit. If you were to remove the positive terminal first and your tool touches any part of the car’s metal body (which is connected to the negative), it could create a short circuit, leading to sparks or potentially damaging the electrical system or the battery. 2. **Preventing Electrical Surges**: When you disconnect the negative terminal, you create a break in the circuit. This helps prevent any electrical surges that could affect onboard electronics when you are working on the car. 3. **Reconnection Order**: When reconnecting the battery, you should connect the positive terminal first and then the negative. This ensures that, if you accidentally touch the tool to the vehicle's body while installing the positive connection, you will not create a short. In summary, always disconnect the negative terminal first to promote safety and prevent electrical issues.