Wiring help.

[Cpl. Opey]

I have a 1996 Explorer Sport 4x4. Just replaced all gaskets, seals and o-rings from the block up. Got everything back together, but I have a female two prong plug that I gave no clue where it goes. It has a dark blue and white wire that I can't find on any wiring diagram. I have it ran behind the compressor for now, but it might go to the back of the engine. Thanks in advance.