The Gem Module is a relay that control the majority of the electrical functions in late model ford vehicles
The GEM is $1200.00 plus labor. Better ideas by Ford
The GEM in a ford windstar is located up inside the dash, above and to the left of the gas pedal. it's held in with a single bolt.
where is the gem module located on a 2002 ford f 250
The gem module on an 03 Ford Explorer is under the dash. It is just to the left of the radio.
Generic Electronic Module
in the fuse panel under dash
I believe the GEM is in the center stack of the dash and that the radio has to be removed to gain access
You can find the module for your 2000 Ford Explorer on the firewall in the engine compartment. The module will be on the drivers side of the firewall.
It doesn't have a GEM it has a VSM located on th efirewall directly behind the radio. Take out radio and remove lower dash assembly and then you can get to it. You will still have to go to dealer for programming.
I'm not sure if your Ranger is the same , but on my 1995 Explorer with a similar dash the GEM is in the center stack of the dash , to the left of the radio On a 1997 Ford Ranget 4x4 the Gem module is located as stated above. Behind the radio and to the left.
http://en.allexperts.com/q/Ford-Repair-811/Fuse-Box.htm