Wiring problems of the 2000 Cadillac SLS

Since I purchased the Cadillac 2000 seville in Mar. 2002, I have had many incidences in which the interior lights did not come on after starting the engine for several minutes, and that the headlights were dim. I took the vehicle into the dealer at kent rylee in rogers, ar, on 1-29-04, and to superior Cadillac in fayetteville, ar on 11-3-04 with the same complaints each time. They could not find anything wrong, as they said because it was difficult to detect the problem with intermittent failures of lights. This is an extreme safety hazard in nighttime and bad weather conditions, as I cannot see what I am doing in the car or outside of it! in addition, the covers for the windows and mirrors adjustment buttons are loose, and I was told by superior Cadillac that the whole door panel would have to be replaced at my cost. This is another safety hazard especially when you try to get the mirrors adjusted at night!.