I doubt you will find that for free, but you can buy them at low cost from ahdol.com
You can find a wiring diagram for a Ford Courier 2003 model in most Chilton's manuals or repair manuals for that vehicle. The wiring diagram will include fuse locations as well as wiring locations.
You can get a free 2003 Ford Explorer Sport Trac wiring diagram online at the Modified Life website. You can also find this diagram in the Ford owner's manual online at Ford.com.
It is the same as my '01 Focus. The schematic is here: http://www.modifiedlife.com/2001-ford-focus-car-stereo-wiring-diagram/ Basically it will tell you what color wire does what
wiring wire harness cooling sistems ford focus 2002
Get a Repair Manual at NAPA, or Auto Zone.
go to Mitchellondemand,com
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http://www.the12volt.com/installbay/forum_posts.asp~TID~61916
The Ford Courier wiring diagram can be obtained from most Ford dealerships. The wiring diagram can also be found at most auto-parts stores.
The stereo wiring diagram for a Ford is a drawing showing the wiring placement for the stereo. The diagram will be different for various cars and trucks.
A diagram of the wiring systems in a car can be used as a guide. A wiring diagram for the 1983 Ford can be found in its maintenance manual.