When connecting jumper cables, it’s essential to understand the correct sequence to ensure a safe and successful jump-start. The question often arises: when connecting jumper cables, which goes on first? This article will guide you through the proper steps to follow when using jumper cables to start a dead battery.
The first cable to connect is the positive (red) cable. This cable should be attached to the positive terminal of the dead battery. The positive terminal is typically marked with a plus sign (+) and is usually larger than the negative terminal. It’s crucial to connect the positive cable to the positive terminal first to prevent sparks, which can be dangerous and potentially ignite hydrogen gas that may be present in the battery.
After connecting the positive cable to the dead battery, the next step is to attach the positive cable to the positive terminal of the functional vehicle. This should be done with the functional vehicle’s engine off to avoid any risk of sparks. Make sure the positive cable is securely fastened to the positive terminal, as a loose connection can hinder the jump-start process.
Now, it’s time to connect the negative (black) cable. The negative cable should be attached to the negative terminal of the dead battery. The negative terminal is typically marked with a minus sign (-) and is usually smaller than the positive terminal. It’s important to note that the negative cable can be connected to either the engine block or the frame of the dead vehicle, as long as it is grounded. However, avoid connecting the negative cable to the battery’s negative terminal on the functional vehicle, as this can cause a short circuit.
Once the negative cable is securely attached to the dead battery, connect the other end of the negative cable to the engine block or frame of the functional vehicle. Again, ensure the connection is tight to prevent any risk of sparks.
With all cables in place, it’s time to start the functional vehicle. Once the engine is running, keep it running for a few minutes to allow the battery to charge. After a few minutes, try to start the dead vehicle. If it starts, leave the cables connected for an additional 10-15 minutes to charge the battery further. Once the dead vehicle is running, carefully disconnect the cables in reverse order: first, the negative cable from the engine block or frame, then the negative cable from the dead battery, followed by the positive cable from the dead battery, and finally, the positive cable from the functional vehicle.
By following these steps, you can safely and effectively use jumper cables to start a dead battery. Always remember to consult the vehicle’s manual for specific instructions, as the placement of the battery terminals may vary between models.
