Graphic Equalizer Installation

Im still looking for the plug in for the graphic equalizer in an 88 T-Bird Sport Coupe. The Ford Dealer tells me there was only one wiring harness made for this car. I have to assume that there is a plug for an equalizer connected to it somewhere. there is a BIG bundle of wires right behind the spot where it mounts into the dash. but no male plug to match the one for the equalizer that I can see. Anybody have one?