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You could be experiencing a corrosion problem in the underhood fuse panel.
The '07 to '14 trucks had the problem, a number of my friends have had their panels changed.
When the dealer stocks each of the 3 panels used by those trucks, you know its a common problem.
But the '15 may not suffer from this problem, this is only a suggestion.
 

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The previous fuse panels were mounted so the wheel splash would hit them on the bottom side. I suspect no splash shield.
Water, salt and electric current makes for quick corrosion.
 
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