What should not be done when performing a jump start?

When performing a jump start, it is critical to ensure proper connections to prevent damage to both vehicles’ electrical systems and ensure safety. The correct practice is to apply the red cable ends to the positive post of the dead battery and the positive post of the working battery.

Applying red cable ends to the negative post can create a dangerous situation. In jumper cable connections, the negative terminal is usually connected last and should ideally be connected to a ground point or metal surface on the engine block of the vehicle with the dead battery, rather than directly to the battery. This minimizes the risk of sparks occurring near the battery, where explosive gases can be present, leading to potential hazards.

In contrast, the other practices such as checking the owner's manual for the correct connections and wearing eye protection are important for ensuring safety and accuracy during the jump start process.