I have a 06 sierra 5.3 and am having an issue with my truck starting after sitting for 12-ish hours. The battery, alternator and starter all test good. No new upgrades and no new electrical work. Recently replaced the radiator however. Also, I have a "service airbag" light that stays on. Any advice or info is appreciated. Are any of the other issues contributing to the battery issue? What else should I check?