Thanks for any input.
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It could be where a plug in set of jumper cables attached. The plug is usually embedded in the grille somewhere. Then there is a set of jumper cables with clamps on one end and the matching plug on the other. Makes it quick, clean and neat to jump, as you don't need to even open the hood. Just one possibility.
This truck doesn't have an extra battery tray on the other side of the radiator, does it?