Hello Everyone-
I need some serious Help. I have a 2001 F150 SuperCrew 5.4 4x4 for about a Year. I use it as a Secondary Driver. It has been having some starting issues the past 2 months. After it would sit for about a week the battery would be dead, I would charge it or jump it and it would drive Fine for a couple of days. Then It got Worse... So I Bought a new Battery from O'Reilly's. The New battery seemed to help for about a week then it started again. Now the truck wont start at all. I have Charged it, and Jumped it and it wont start. I took the alternator off and had it tested, it Passed all test. I'm thinking it might be an electrical Short somewhere but I have no clue where to start. When I try to start it, it will turn over but never start. I appreciate all the Help. Thanks Kyle

 

Try shorting the fire wall relay posts its under the cover right next to the battery turn the key on short the big post to the small one. if it starts replace the relay. Check the starter motor connections they are prone to corrosion..

 

You missed the original problem by not haveing the charging system checked out and just jumped on the battery as the cause.
What you have is a faulty alternator that is discharging the battery when setting over time.
How bad the fault is and how good the battery is and what charge it begins at after the last run, determines how fast the battery will go flat.
Look for the alternator to be replaced.
Next, by the fooling around, the condition has the start locked out in all likelyhood. Sometimes it even locks the doors if you have electric locks so keep a key outside. This is all part of security actions.
Get the alternator issue cleared, clean the cables and see what you get.
Good luck.