'84 Ram 50 and the headlights quit working. My son said he had seen the lights flicker a couple of times in the last week and now they won't come on. Running lights work and he says you can hear the relay click when you select running and then head lights. He checked the fuses also and they're good. He doesn't live nearby so I'm trying to diagnose the problem over the phone. Any suggestion/advice on where to start looking?