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did you say you have a wire thats plugged into the block heater that has no plug on the bumper end? i think my answer is yes but i'm not to sure what your wire is jim.
If you found the wire that is plugged into the block, then you need to trace to the other end, its wrapped up and tucked behind the passenger side bumper and it aint easy to see. It will have the male plug on the end if you are looking at the right wire. Block heater is inside the passenger front wheel well 2/3 down the block towards back of the truck and has 3 prongs male sticking out the frost hole with this three wire cable plugged onto it with a female end. If you find the empty block plug, then go to an IH dealer for the cord, cheaper than ford.