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Sorry it took me so long to reply. Here's what I did if it helps. I took a complete courtesy light wiring set up from a 73 C-10, I mean everything, door jamb switches & all. A 73 C-10 only has one floor lamp which is mounted a little off center to the passenger side. I felt this wasn't enough so I also added courtesy lamps & brackets from a square body Jeep Cherokee (the same one I pulled my door check straps from) The 73 C-10 door jamb switches are 3/8" X 24 thread so you will need to drill your door jambs with a "Q" size drill bit and tap to 3/8" X 24 threads. I had to stack a couple of flat washers on mine to shim them out enough to get the curtesy lights to shut off when the doors were closed. (I used Stainless steel flat wasers). The 73 C-10 has rubber grommets moulded onto the wires where they pass through the kick panel. These factory grommets require a 1-1/8" hole. That big hole makes it easy to fish the wire down the inside of the kick panel. Once the holes are drilled and tapped for the door jamb switches I took a wire coat hanger, cut it & bent it into a sharp "U" at the end to grab & pull the wire through door jamb switch hole. Since the jamb switches complete the ground circut I would only do one side at a time and test to make sure the lights go out when the door is closed. I would start out using 2 flat washers on the jamb switches. I like me "JUNK" to look factory so I pulled my fuse box and spliced the 73 wiring in where it wouldn't be seen. If you look closely you can see where my red heat shrink tubing shows at the base of the fuse panel (Darn).