my cluster lights that are supposed to come on and light up my speedometer when i switch on my headlights won't turn on. I checked the bulbs they were ok. I am getting no power to the bulbs. I don't know where to begin. I have already checked my fuses but that is as far as i can go. I have a grey and a black wire going to the first bulb. that bulb is supposed to feed the others. also it's a seventy two malibu.