I installed a solar panel on my 2002 22' CCD and found the wiring located near the front fantastic fan vent. I removed the trim for the fantastic fan (from the inside) and found the wires there as described in the AS owner's manual. I forget what colors they were, but the manual should tell you. If you're having trouble let me know and I'll check my manual for you. But, as I recall, I removed the trim, looked around a bit, and found the wires pretty easily.
I then drilled a hole in the side of the Fantastic Fan frame, above the roofline, and fed the wires from my solar panel trough there, then crimped and soldered the connections with the wires inside the CCD. I thoroughly caulked the hole and have had no troubles for the three years I've had the panel mounted.
2002 22' CCD
2008 Dodge Ram 1500 5.7L Hemi