When changing an alternator on a car, the first step is to loosen up the negative battery terminal and the belt tension. Remove the bolts and set them aside when removing an alternator with help from an auto mechanic in this free video on car repair and diagnostics. Expert: Tom Brintzenhofe Bio: Thomas Brintzenhofe has been a certified mechanic for the past 14 years, and a certified master mechanic for the past eight years. Filmmaker: Reel Media LLC