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What year is your Explorer and what color are the wires? Automatic or manual transmission? Is that view looking north at the south end of the transfer case? I have wiring diagrams for a '98 and shop manuals for one or two other (earlier) years. I can try to match the wire colors with the diagrams.
More than likely your HAL sensor. Mine has done this. I'm not sure why these wires have a bind on them and seem to want to pull out of the sensor. Those sensor are hard to find and not cheap.