1992 GMC Keyless entry install

I am trying to install a keyless entry system on my 1992 GMC Pick up.  I understand the instructions on what wires to cut and splice.  I have pulled the plate off the door locks so I know what color the wires are.  The problem I am having is where do the wires come out?  I see them in door panel, but I cannot see where they are after they leave that.  I found a big wiring harness under the dash, took some of the tape off of it and examined the wires but cannot find the door lock wires.  I have seen other posts with different vehicles that say look under the glove box, would GMC have them under the glove box?

Any help would be appreciated.