2004 Ford Expedition 5.4

That may not be a wire but a vacuum line. There is a vacuum tank behind the battery that looks like part of the battery box.

After looking at this better it is a vacuum line for sure it's about 3 ft in length just about reaches the alternator

I betcha it is the vacuum tank line. You will need to remove the battery to access the connection.

Ok I'm going to pull the battery and check. I have looked everywhere and dnt see where else it would go..

If that does not do it check the EGR valve vacuum connection.

It goes to the round thing just to the left of the pictured vacuum line. Pretty sure it is a heater water control valve vacuum line.

Tom and F_O_R, time for an eye exam.

Bob you were correct sir thank you... Sitting right in front of me and missed it..lol always missed the obvious.. Thanks for everyone's help

Can someone tell me where the vacuum line go

Thank you so much the picture was very helpful