What is the first step in jump-starting a vehicle?

The first step in jump-starting a vehicle is connecting the negative cable to the chassis of the vehicle with the dead battery. This step is critical as it serves to create a safe ground for the jump-starting process. By connecting to the chassis, you minimize the risk of sparks igniting any hydrogen gas that may have accumulated around the battery, which could create a dangerous explosion. This grounding method ensures that any electrical discharge happens in a controlled manner away from the battery itself, enhancing safety.

Once this initial connection is made, the next steps involve connecting the positive terminals of both batteries, then connecting the negative cable to the good battery's negative terminal before finally attempting to start the dead vehicle. It’s essential to follow this order to reduce risks and ensure a successful jump-start.