I just bought a '91 Sovereign and have a problem with the dash board lights. These are not the warning lights, but the illumination for the gauges that are supposed to go on with the headlights. They do not work properly. They are on all they time. To turn them off, the previous owner disconnected the gray connector coming off the dimmer control. To turn them on, I have to reconnect it. Once on, the lights do not dim when the rheostat is turned, but the lights for the climate control work properly. Any ideas?