(1988 Nissan Sentra)Put in a new stereo and I cant seem to find out how the dashboard lights work. I'm left with two wires one being green and another that is black. If I hook the black to a hot the dash lights come on. If i touch the green to the hot at the same time the dash lights will turn off. Don't know where to connect these wires so they work with my head light switch. Any help would be great.