Cab Markers 2003 Chevrolet 2500

Hello. I got my truck a few years ago. It has the typical looking factory cab lights (1 on left, big middle one, and 1 on right). I assume they are factory but not so on the wiring. I 'heard' they are factory wired to the headlights on these trucks. On my truck, I start the engine and all lights come on ( heads and tales). No DRL ever lluminate. I can turn the switch ccw to turn all lights off, move it to parking and the heads will darken. ....anyways on to the cab lights.... They 'were' wired to an under dash toggle switch and 'was' able to turn the switch to parking or headlights (would not come on in the standard AUTO setting) and flip up the toggle and the toggle switch would glow and I would have light from the roof lamps. Well, I cut a wire at some point since I was basically making this into a show truck and was not going to be needing the accessories at this time. It has a trailer brake controller, big pigtail for heavy trailers and there was some kind of crane hooked up at some point. What led me to cutting wires was I kept having taillight/license lamp issues and found a lot of small gnat like living insect in some of the loom near where to spare tire mounts. This got me paranoid about all of the aftermarket wiring on the truck and I went overboard I guess and cut the wrong wires. The Cavs were yellow/red wires with the yellow being grounded twice (driver and passenger sides). The red wires merge and go into one prong on the 3 part toggle. There is a black wire under the steering wheel by the toggle that I tried touching to the other pins of the toggle. I guess it wasn't a power wire or not fused. To make a toggle work you just need a 12v wire and the wire to the lights, correct? Wouldn't I run a 12v to the middle prong and the lights to either the upper or lower prong depending on which orientation I wanted the toggle to be on or off? So, if all this is correct, then how and where do I find a live wire (without being intrusive) and probably fuse it to the fuse panel at the driver's door and have everything working without potentially harming or burning wire harnesses (hooked up nitrous a while back when I understood 12v and a helper grounded a live wire and the wire almost melted an entire bundle of wires when we were wiring the toggle). Anyway, I have asked the dealership, and independent, and the car audio shop that installed the sound system but I would kind of rather DIY to not trouble them. Tools are limited.

Okay, so some wiring was cut and you're trying to make your roof lights work with a toggle switch, right? You've made some generalizations that may or may not be correct. It's tough to say without having the vehicle in front of me. You need to trace your wiring and test with a multimeter. If this is not something you are comfortable with, your local stereo shop should be more than capable.My ex once told me I have a perfect face for radio.