How Thick Should the Jumper Cables Be for a Car?
2 Answers
For household cars, it is recommended to use copper jumper cables with an outer diameter of 10mm or more. When purchasing, not only the thickness matters but also the length. Overly long jumper cables can lead to power loss, making it difficult to start the vehicle. Generally, jumper cables with a length of 3-4 meters are sufficient. Procedure for connecting jumper cables for household cars: 1. First, attach the red clamp of the jumper cable to the red positive terminal of the "dead car" battery. Then, attach the other end of the red cable to the red positive terminal of the "rescue car" battery. 2. Connect the black clamp to the black negative terminal of the "dead car" battery. Next, attach the black clamp to the black negative terminal of the "rescue car" battery. Start the engine of the "rescue car" first, then attempt to start the engine of the "dead car". 3. If the dead car still fails to start, check for poor metal contact. After successfully starting the engine, remove the jumper cables in the correct order to avoid potential short circuits.
I once helped a friend jump-start his car using a thin cable, and the cable started smoking and almost caught fire—it was really scary. That experience taught me a harsh lesson: the current during a car startup is enormous, reaching hundreds of amps, and thin cables simply can't handle it. I recommend using 10-gauge copper cables—the thicker, the better, especially for large-displacement vehicles or when the battery is weak in winter. Short cables are also troublesome; a length of 2-3 meters is ideal, making it easier to position the cars safely apart. When buying, don’t skimp—choose pure copper with thick, spark-resistant insulation. Regularly inspect the cables for cracks or wear, and replace them after about ten uses—safety comes first. If something goes wrong, not only could the car be damaged, but you might also injure your hands!
