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Also, and I have seen this more than once, if the batteries are just plumb worn out, the starter will not disengage, even with the key off.
Sounds strange, but it's true.
If replacing the relay does not fix it, you will need new batteries.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.