In our state, license plate light and the center high stop light is required, but with the new computer controlled, key switched, lighting systems on the newer vehicles, you must do some additional wiring to get this to happen on the Silverado and other vehicles. I added additional diodes and mine work when they are supposed to. Check with your local DMV or as 100ton said, you're liable to be contributing to state coffers due to tight money issues. If it's on the books, it's a potential money generator, or at least a reason for a stop (PC) for innumerable other issues.
