Originally Posted by GARETH T
connet the positive first
you do this because if you connect the neg first, then tighten up the positive terminal and the spanner touches the chassis it will cause a short

good advice as always from the G man
apart from that there is no particular reason why you should connect either first..
ps. you only do the spanner shorting on the bodywork trick once, to learn that Gareth's method is best...