I am trying to install courtesy lights with the GMC logo on my 2008 Sierra but after getting the first one drilled I realized there is not a light in the reflector on the door. Can anyone provide the related diagram for the wiring within the door / does anyone know if any of the door lights are only activated when the door is opened so that I can tie into those wires? It's a crew cab so I will be attempting to install them on all four doors. TIA.