My prodigy has a four wire harness on it. I don't remember how it's hooked up but if you go to tekonsha.com you can down load the wiring diagrams. IIRC the wires are universal in coding. As far as the plug at the back of the truck, It may not have ever been put in. You can look under the bed for a harness that terminates near the bumper. My '86 had the harness and I had to add the plug and wires.
Trailer Wiring Diagrams
Here is where you can see the different plugs and the schematics. Hope this helps 
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1994 F-350 7.3 IDI Turbo, crew cab, E4OD,4:10 L/S, LB, Dually Photos
ATS Turbo upgrades: 3" DP with 3" exhaust Magnaflow XL muffler: Pictures Here
1997 Jayco 323RKS fifth wheel w/2 slides, Air Lift 5000 bags
Pillar pod: Autometer C2 Series gauges: pyro,trans, boost, water, oil pressure 
Hypermax Cowl induction, K&N air filter, flex-a-lite 26K trans cooler with fan,Tekonsha prodigy
Train Horns: Pictures here
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