If you make a mistake removing the positive terminal, like hitting the bocy
of the vehicle with your wrench, you will get a dead short and major
fireworks.  But the negative terminal is already ground or the vehicle body,
a mistake has no consequence.  As a general rule the ground side of a
circuit should always be closed last since there is zero voltage potential
and should have no spark.

On Mon, Aug 4, 2008 at 5:02 PM, Jere Hawn <jghawn@earthlink.net> wrote:

> The manuals (all the auto manual that I have seen in my life) say to
> disconnect the negative terminal from the batter before performing.. X, Y,
> Z,. etc.  Why the negative and not the positive one?  Does it matter, is
> negative more dangerous that the +?
>
>