Well after looking at my parts Jeep, my CJ (which is a wiring nightmare with the motor swap and fiberglass tub), and a bunch of wiring harnesses from other CJ's that I have parted out I think I have this figured out.
Yes your correct the 5 wire plug is for the rear lights and sending unit. The 4 wire plug is for the factory driving light switch which was standard in Laredo edition CJ's. The orange wire off of the headlight harness is where the factory driving lights would plug in.
Driving light switch and relay.
The orange and black wires should have plugs on them and they are for the under dash lights that came on Laredo's and Renegades.