I just saw this thread. The reason some advise connecting the negative to a ground is to avoid the situation where a spark from connecting to the negative terminal on a battery ignites combustible gases from the battery. There have been cases where batteries have exploded into peoples faces. But sometimes you cannot get a good ground a you just take your chances and connect to the negative terminal. LOL The Porsche manual also has to consider legal liability.
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'04 Black Boxster, 18" Carerra wheels
"If you're not living on the edge, you're taking up too much space."
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