Red Seal Truck and Transport Mechanic Practice Exam

What is the correct procedure for jump-starting a truck?

1. Connect positive terminals first, then start the engine

2. Connect positive terminals, connect negative terminal to the ground

3. Connect all terminals simultaneously

4. Connect negative terminals first, then positive

The correct answer is: Connect positive terminals, connect negative terminal to the ground

The procedure for jump-starting a truck involves proper sequencing to ensure safety and effectiveness. Connecting the positive terminals first is essential because it allows the transfer of power from the donor vehicle's battery to the dead battery. After connecting the positive terminals, the next step is to connect the negative terminal, and crucially, it should be connected to a grounding point on the frame of the truck with the dead battery. This step minimizes the risk of sparks near the battery, which can be dangerous due to the presence of flammable gases. By grounding the negative connection, any potential arcing that might occur during the connection happens away from the battery, reducing the risk of an explosion or fire. This systematic approach not only ensures that the jump-starting process works effectively but also prioritizes safety for the person performing the jump-start and any onlookers. Understanding this procedure is critical for anyone working on trucks, as improper methods can lead to damaging vehicles or causing accidents.