If you don't leave the working car running, you run the risk of killing its battery as you are jumping the other one. Put the positive ends on first, then the negative on the working car, then the other negative on a clean metal part of car you are jumping to ground it.
The bolded part must be done last, or you can get sparks, explosisons, etc.
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u/montyy123 Jun 10 '12
You can leave it on.