here you go
for the ECM, sorry i left that part out
you do not need the extra 7 pin if your not running electri brakes
sfn
You need a 7 pin circular to 4 pin flat adapter. www.trailvoy.com
You need to specify what type of connector. Most likely, you'll be using a seven blade connector, although six pin, five pin, and four pin connectors are also a possibility. The latter two would only be used if your trailer was not equipped with trailer brakes.
www.wimtv.be/techniforum/files/crt2574_deh-3300r.pdf page 51 shows pin out diagram.
The hitch on my 2002 comes with a 4 pin flat plug. But it really depends on the trailer plug. There are adapters for the 5 pin round plugs but you need a brake controller if your trailer has brakes.
If it is the factory radio, then the pin-outs diagram should be stamped into the metal on the radio it-self.
try the12volt.com i know for a fact thay have one Try http://www.ahdol.com/ for the diagram.
Most fords place a wiring diagram on the top cover of their radios.You can use the pin connections to locate the correct wires for each speaker.
If you have a hitch installed under the rear bumper and round 7-pin wiring.
check the ground wire on the trailer. if it is corroded at all they may not work. take a file to where the ground wire is hooked up to make sure it is on bare metal