Will not crank how ? What happens when you turn the key to the start position ? Nothing or the engine spins around ? Does the security light flash fast ? anti-theft system problem . Anti-theft system problem will keep the engine from cranking .
Starter relay could be bad , just depends on what you mean by won't crank . Some people will tell you it won't crank ,but engine does spin when turning the key to start . Crank no start an run .
Or no crank no start
Could be more then a couple of thing's , this has a computer controlled starting system .
You need to check all your connections from the battery first the power distribution box cable and fuses and relays and then at the starter and observe the braided cable that goes into the starter case if it's frayed or broken the starter case is not grounded and you will only get 1 clank or nothing when you turn the key your truck is now 14-15 years old and that's usually when the starters go 12-15 years is the service life depending on use
That's all well an good telling someone check this or that , but if they don't know how to test electrical circuits using voltage drop , using wiring diagrams so they know what wires to test ,it's useless . Everyone think's they know best . Do they know what a wiring diagram is ? What volage drop is ? do you ? https://www.youtube.com/watch?v=XhRPLgH6...
I have thrity years plus experience working for ford . What's your qualifacations
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It could be a couple things one your ignition switch but before you change that out go straight to the solenoid and test it first
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