7. Ground the Negative on the Dead Car
Here's where some people's instructions might differ. Some people go right ahead and attach the negative clamp to the negative terminal on the dead car. Don't do this. You're running the risk of a spark igniting the hydrogen that the battery produces. This is pretty unlikely, but it's not worth taking the chance. Instead, take the remaining negative claimp and put it on a different metal piece on the engine block away from the battery to ground the connection.