2001 f150 5.4 ran it monday no issues, it sat tuesday, went out this am to head to work won't start. I tried jumping it no luck. when i roll the starter over everything in the cab goes out all the idiot lights interior lights go out so out of curiosity i turned the headlights on and rolled it over and they stay on and don't even seem to dim, it is the same results with the jumpers on it? I can here a single click. this kind of threw me for a loop as i was thinking battery but that wouldn't make sense if the head lights stay on would it?. I did check the wires going to the starter they seem to be intact and tight. and then the rain came so i figured i'd ask for suggestions so if anyone has any of those it would be greatly appreciated.

 

Check the grounds! Had a similar problem on my 97. The Ground from the battery cable, accessory wire was corroded well into the insulation. Cut out the corroded section, and everything started working as expected.

 

This should be helpful to you. Good luck!

https://www.ford-trucks.com/forums/742231-97-f-150-wont-start-anti-theft-please-help.html#post6161135
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