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2003 Expedition will not start. help!

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Old Nov 9, 2015 | 07:52 PM
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2003 Expedition will not start. help!

My truck was running fine. When i arrived home and then tried to leave to go to store it would not crank. All lights on dash come on. Battery is fine. Has new starter and alternator. If i disconnect the battery for a few hours it will start and go for awhile then shut down again. The theft light by windshield normally blinks when parked but it is not. If i disconnect battery the reconnect the theft light blinks really fast then regular then no light.
 
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Old Nov 10, 2015 | 06:20 AM
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Battery is fine.
How do you know that?

Has new starter and alternator.
An observation learned the HARD way: Just because a part is new does not assure it is "good". It's only "good" when you have proven it to be so.

it will start and go for awhile then shut down again.
Describe exactly what observations you've made when it "shuts down".
 
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Old Nov 10, 2015 | 07:19 AM
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I had these parts tested. Battery is fully charged. Car will start up fine one hour and the next it will not even crank.
 
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Old Nov 10, 2015 | 07:20 AM
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Only thing I noticed differently about it is the antitheft light on dash
 
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Old Nov 10, 2015 | 08:38 AM
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What does the antitheft light do, and what's different when it starts and does not start?
 
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Old Nov 10, 2015 | 08:47 AM
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Did you try starting it in neutral?
 
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