I know disconnect the positive and negative does the same thing. Just that the best practice is always the negative 1st, then the positive. Same with Jump starting your car.
http://www.ehow.com/how_2278932_disconnect-car-battery.html
Remember the negative is the ground which is the same as your car metal. If one disconnect the positive, and accidently touch the positive connection, then your body can become the circuit betweent + & -. But not if you disconnect the negative. It's supposed to be auto battery safety 101. |