I am having the same issue (still). Lamps are good new switch on tranny cannot find any fuse mrked for reverse or reverse for trailer. (trailers reverse lights don'twork either). I'm an electrician, have al kinds of meters ,so I know I'm not getting powerto my switch, but cannot find any other fuses than under the hood. I'm ready to run a new circuit from my battery the same time I'm wiring my driving lites.
le me knowwhat you find out.
2006 3500 "BIGHORN" 5.9l 62,000 miles, 4" lift, 35" procomp A/T tires, pac brake airbags with control inside and PRXB exhaust brake,