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First off I would check your belt, but most likely its your alternator, take it into your local Ford dealership for a load test. I have seen some that work at an idle but not past 1500 rpm's.
I think the altenator for your truck runs about 300 dollars, I had the dealer replace mine before I bought the truck because the light was flashing on mine too.
Rezvani's Latest Post-Apocalyptic 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.
