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mattcraighead 01-24-2009, 07:23 PM Ok so my dad has a 02 Duramax 4x4 extednded cab. If you leave the key in the ignition for a while say overnight it runs the battery dead, but if you take the key out of the ignition it is fine. It has a new alternator on it, as well as new batteries. Anyone else had this problem or any ideas what it could be? Spitz 01-24-2009, 07:31 PM Leave the key out of the ignition.. The key in ignition may keep certain modules awake and draining... drew1234567 01-24-2009, 08:16 PM Why does your dad need to keep the key in the ignition overnite? big truck big power 01-24-2009, 08:24 PM i do it to mine when its in the garage, or at a friends house that is set back about .5 miles of the road. | ||