The belt that turns the alternator and battery is very loose and the 'battery not charging' comes on. How much does the belt cost?

What is your question?

Car starts intermittantly Battery not charging light comes on the dashboard Starts when foot on the brake only Shift to drive, take foot off brake and engine dies

What makes this problem better or worse?

Sometimes when the car sits for awhile it seems to start fine, and dies a few minutes later

How long has your 2003 Cadillac DeVille had this problem?

Recently only