if you do the negative first you
1) wont have to worry about grounding the wrench
2) won't have to worry about grounding the Pos side when you've disconecting b/c you've already "undone" the circuit
However, I've been wrong a number of times.. witness Beta v VHS and Now. Blue Ray v.....HDDVD.. etc.. etc....
More important is always wear protective eye gear. Knowing where the nearest hose is located would also be a plus. I've seen two batteries explode in my life, really, really impressive, pretty much a bomb. One of the reasons I went to all gel or sealed lead acid on all my cars.
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