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If there is any current flowing through the system removing the positive wire will produce a spark. Vapor from a battery is explosive and sparks not good.
Try it some time if you don't believe me. Turn on your parking lights and connect the positive wire and see the spark. Now do it the other way and do the ground. You will see no spark. This is DANGEROUS so please don't do this. Just take my word for it. I can't remember how many times I have read disconnect the negative battery cable before working on your car. It even says if you need to jump start a car hook the negative cable up last.
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