Focus Fanatics - Need help with a zetec wiring connection.

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Need help with a zetec wiring connection.

I am replacing my alternator from the top instead of from below, what a hassle. Now that I'm putting it back together, I have one wiring harness connection "left over", I cannot find where it connects. I've tried holding a mirror and a camera behind the engine but cannot see where this is supposed to plug. After becoming rather frustrated, I'm posting here hoping that someone can help me with this. Anyone know where this grey plug is supposed to go??

http://i1277.photobucket.com/albums/...ps733ecb9d.jpg
http://i1277.photobucket.com/albums/...psc95a31f7.jpg
http://i1277.photobucket.com/albums/...ps73cb30d7.jpg

Wire colours would help with a positive ID.
Fuel pressure sensor and cylinder head temp sender are in that area.

Ok thank you, it's to the temp sender. Now I know about where it goes but still can't see it. Maybe I should have plugged it in before the alternator. Still looking but this was a big help.