That last guy gave some great advice. Here's my thought. Try his first. If you don't find anything wrong then clean your battery terminals and cable ends real good with a wire brush. GM battery terminals are prone to corrosion so go to Advance Autoparts and buy yourself a set of Autocraft Anticorrosion Battery Washers (2-Pack) 98 cents
Part No. AC184/A1601312.
My thoughts are that this is a corrosion issue. I've seen several cars not start because of a thin layer of corrosion across the terminals which does not allow the alternator to do its job. Everything will seem o.K. Until the day the car decides it's had enough and doesn't want to start.
Monday, October 11th, 2010 AT 1:30 PM