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You need to remove the negative (black) cable attached to whichever car's chassis, first.

Now if you accidently touch the chassis with the lead, nothing will happen, it's already negative. (This should be as far away from the battery as possible. ) Then, remove the other car's negative jumper.

Now, the positive sides can be taken off, safely, If you accidently touch the chassis with the leads, there will be no spark as the two chassis' are now isolated.

If you took off a positive (red) first, since the other end is still connected to a positive side of a battery and the two chassis' are connected, yYou could easily touch the chassis and make a spark, and possibly igniting any hydrogen gas from the battery, blowing its top off, and spraying sulfuric acid.

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Q: Why do you need to take the leads off in the reverse order after trying to jump start a car?
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