When jump-starting a vehicle, where is the safest location to make the last connection?

When jump-starting a vehicle, making the last connection at a negative point away from the weak battery is considered the safest practice. This approach minimizes the risk of sparking near the battery, which can release explosive gases. By connecting the negative cable to a grounded metal surface on the vehicle with the weak battery, you create a safer environment for the operation.

Connecting directly to the negative terminal of the weak battery could cause sparks next to the battery, increasing the risk of igniting any hydrogen gas present. While connecting to the positive terminals on either battery is necessary for the process, determining the safest point for the last negative connection helps mitigate safety risks during jump-starting. Therefore, making the final negative connection away from the battery significantly enhances safety while jump-starting a vehicle.