always always always - first if you are takeing off + and you have your wrench on the nut and your wrench tuches the frame boom instintly you have just fused the wrench to the frame (the frame has negitive running through it "ground") my teacher once told me about this guy that was removeing the + b4 the - and he was whereing his wedding band and his band was tuching the wrench and then his band tuched the fame and it became fused to his finger and had to have it removed and he had 3rd degree burns where the ring was...
shop safty!
~Peter
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