Why do you disconnect the negative side of a battery first?
Why do you disconnect the negative side of a battery first? Negative first It's important to disconnect the negative side of the battery first, otherwise you can cause an electrical short if the positive is removed first. Do you disconnect the positive or negative battery first? When you remove the battery, always disconnect the negative cable first. (It’s usually black, and the corresponding terminal on the battery is normally marked with a “-” sign). If you switch this order, nothing bad will happen — if you don’t make contact between the positive side of the circuit and the ground. Why...