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HiCustomer I'm sending you instructions right out of the GM service manual. This is the recommended way. If you have problems or other questions, just drop me a note.Thanks
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Caution: Batteries generate hydrogen gas, which is extremely flammable and may explode violently if ignited by a spark or a flame. Battery acid is extremely corrosive and causes severe personal injury if the acid comes into contact with the skin, and blindness if the acid comes into contact with the eyes. In order to avoid severe personal injury, use extreme caution when servicing the battery or battery-related components.
Important: Do not tip the battery more than 40 degrees.
Tighten Tighten the bolt to 17 N·m (13 lb ft).
Tighten Tighten the bolt to 16 N·m (12 lb ft).