Ok, so as the title says, I gotta headlight issue with my '81 N/A 2+2 and wanted to know what you guys think it might be. When I go to turn on my lights, the running lights will turn on but when I turn the switch to headlights, they won't come on. When I flip the switch back and forth from running lights to headlights, they will sometimes come on, and when they do, they will stay on until I turn them off. Also, when they DO turn on, they don't flicker, nor do they dim or anything. I've checked and cleaned the connections in the combination switch, I also checked the fuses, all to no avail. Also, now after a few days, they no longer come on at all. I've been looking through my Nissan service manual, and I think the problem might be the Headlamp Sensor, which is located right in front of the relay box in the engine bay. But unfortunately there's no info about what this "Headlamp Sensor" is, or what it does exactly. Can you guys help? Thankx a lot!