I tapped into one on the drivers side had to use a micro2 add a fuse deal like this https://www.google.com/search?q=mini+fuse+tap&safe=strict&rls=com.microsoft:en-US:IE-Address&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwjVj8SBrarJAhVJXhoKHef_D8oQsAQIRw&biw=1920&bih=1052#safe=strict&tbm=isch&q=micro2+fuse+tap&imgrc=LYxagYpfa62X_M%3A I will take a picture for you later today
what a pain, so if you do a HID retrofit wether projector or not the on the silverados your HID's are basically always on or you have to constantly turn the stupid nob