Well, once again you are spot on Bill! I went out in the garage, turned on the key, and looked at my license plate area.The license plate light gets power from Br and Bl leads on the wiring harness. They change at the connector to Gr and B/W to run to the light. The license plate light is commonly removed when a fender eliminator is installed, oftentimes by a hack who just yanks it apart at the connector. Your leads sound like them. Depending on the design of the fender eliminator, the plate may not be illuminated. Cops tend to not like that, i.e. it's illegal.
I's lit up- from the tail light. My plate is up on a mount, right directly under the tail light. So there is that LOL.
Now I know I have a hot lead and ground under there- that I doubt I'll ever use.
Oh wait- I could hook up some neons!--NOT, J/K, not this guy.