1. Stop immediately and do not proceed**: Sparks indicate that there's a significant risk of explosion and electrical damage. Disconnect any connected jumper cables to ensure safety.
2. Identify the cause of the sparking**: Some possible causes for the sparks include touching the wrong terminals (incorrect polarity), faulty battery, short-circuiting caused by a loose cable, or excessive corrosion on the battery terminals.
3. Correct terminal connection**: Double-check if the red (positive) and black (negative) jumper cables are properly connected to their respective terminals on both the charged (or good) battery and the drained (or weak) battery.
4. Clean battery terminals**: If necessary, thoroughly clean the battery terminals and cable ends using a wire brush or sand paper to eliminate any corrosion or oxidation that might cause problems in establishing a solid contact.
5. Reconnect with caution**: Start the process again, making sure that everything is properly connected to the corresponding terminals. Be slow and gentle when touching the positive and negative ends of the cables to their designated terminals at the batteries. Don't let the positive and negative ends meet each other at any point.
Note: If the sparking problem persists, consult a professional to safely handle any potential issues with cables, battery, or other electrical components in your vehicle.
