Headlight/parking Light Problem!

I had a local shop put in a Quik Wire system in my 73 Duster, everything works great except I have only have headlights w/parking lights on either of the two step pulls on the headlight switch. I cant have just the parking lights on by themselves. its a stock switch,(i checked it, its good) any quick fix or wiring diagrams any of you electrical experts may know of. Thanks!