No, you should never connect the black (negative) jumper cable clamp to the positive battery terminal. This is a critical safety rule to prevent electrical shorts, sparks, battery explosions, and severe personal injury. The correct and safe connection order is: red clamp to the dead battery's positive terminal, then the other red clamp to the good battery's positive terminal. Next, connect the black clamp to the good battery's negative terminal, and finally, attach the final black clamp to an unpainted metal engine bolt or chassis component on the dead car—not to its negative battery post.
This method, known as connecting to a "ground" on the dead vehicle, minimizes the risk of sparking near the battery, which could ignite explosive hydrogen gas emitted by the battery. A single spark can cause a battery to explode with enough force to cause blindness or other serious injuries. Industry safety records indicate that incorrect jumper cable connections are a leading cause of automotive battery-related incidents.
The standard color coding—red for positive (+) and black for negative (-)—is universal for a reason. It provides a visual guide to prevent dangerous mistakes. When jump-starting, the sequence also matters for safety. Connecting the final black cable to a solid metal ground on the disabled vehicle, rather than its negative terminal, ensures any final spark occurs away from the battery itself.
Here is a quick reference table for correct vs. incorrect connections:
| Connection Point | CORRECT Procedure | INCORRECT & Dangerous Procedure |
|---|
| Dead Battery Positive (+) | Red Clamp | Black Clamp |
| Good Battery Positive (+) | Red Clamp | Black Clamp |
| Good Battery Negative (-) | Black Clamp | Red Clamp |
| Dead Car's Final Connection | Black Clamp to unpainted metal | Black Clamp directly to dead battery's negative (-) post |
A common mistake is attaching all clamps directly to the battery terminals. While this might work, it significantly increases hazard potential. Modern vehicles with complex electronics are particularly vulnerable to voltage spikes from incorrect jumps; repair costs for damaged engine control units can exceed $1,000. Always consult your vehicle's owner manual first, as some manufacturers specify unique jump-start points under the hood to protect onboard computers.
If you are unsure or the cables or terminals are heavily corroded, it is safer to call for professional roadside assistance. The process is simple when done correctly but unforgiving of errors. The core principle remains absolute: the black cable's path must never complete a circuit through a positive terminal.
