Mybigfeet2

Bought an '11 f150 5.0 in july 14 and drive for a few weeks and the battery light started coming on. Checked it out n was told by dealer that alternator was bad. Replaced it and fixed it for a week or 2 and the same thing started happening. To the point where it is dead everyday for the last 6 months. Have done alternators battery plug ends and checked all connections I can find. Now have a brand new battery and brand new alternator. Truck is dead again after everything tested perfect. Any and all help is appreciated as I owe $30000 still.