What is the first step when replacing a battery?

When replacing a battery, the first step is to disconnect the negative terminal. This is important for safety reasons. Disconnecting the negative terminal first prevents any accidental short circuits that could occur if the tool touches a grounded surface while working on the positive terminal. By removing the negative connection first, you significantly reduce the risk of electric shock and potential damage to the vehicle's electrical system.

After the negative terminal is disconnected, it becomes safer to remove the battery from the compartment, check for corrosion, or inspect the wiring harness. These actions can follow the disconnection step without risking electric shock or unintended consequences. Thus, starting with the negative terminal ensures that the battery replacement process begins safely.