I have a F-250 (Gas) that whenever it sets for over 2 weeks without starting, the battery appears to be dead and it won't start (Click / Click).. Once I jump it, it starts right up and I can IMMEDIATELY shut it off and it start gain with no signs of a dead battery... The battery is only 1 year old.. Maybe the battery is OK.. any ideas?

 

Get the battery checked - two weeks sitting it should start up fine. Also, you may want to get a battery charger in the future. It's always a good investment anyway. Good luck!

 

I would start by cleaning the battery cable ends and posts.