2000 Pontiac Grand Am • 108,000 miles

So I went to work the other day and car cranked up fine and when I went out to go to lunch it wouldnt crank had to get a jump was fine until today went out to go to work car acted like it was gonna crank but didnt came in to call for a jump went out about had the battery tested thursday they said it was good
Joe 32
April 14, 2012.

Here is a walk through diagnostic for your situation. Just use the link below to get to it.