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This is a safety precaution. Disconnecting the ground cable protects you from accidental shocks, accidental engine starts (by someone unaware of your presence underneath, perhaps), in airbag equipped vehicles it prevents the airbag from deploying accidentally (expensive and/or injurious). Obviously, if the repairs in question require that battery power be available, you wouldn't disconnect it, but the protection it offers is well worth the extra minute it takes to disconnect the cable. As far as why the negative instead of the positive cable is disconnected, the reason is that if you are touching the positive cable and anywhere else on the vehicle, you'll get shocked. Not so, with the negative cable. Also, the negative cable seems less prone to sparking than the positive cable. If, however, you are working on a vehicle with positive ground (uncommon in North America), the positive (ground) cable is to be disconnected

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What is the procedure of the baterry?

The vehicle battery's main purpose is to supply power for the starting system and to power some accessories when the engine is not running. The proper procedure for changing or installing a battery... remove the battery cable first from the negative battery terminal, then from the positive. Install opposite, attach the positive cable lead, then the negative.


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