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Andy you sure it's the alternator and not the batteries??
If he is switching batteries and still having the same result then yes. The easy way to make sure it's the alternator is to whip out the multimeter and get checking.
I'm really surprised your alternator is going out this early in the life of the truck though. As far as I know I'm still on my factory alternator.
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.