I replaced my light fixture and wired it like the old one. But the light isnt turning on so i must have made a mistake. Unfortunately, I cant follow the wires in th eloft to figure out what's what. When the light switch is on i've got 1. a pair of black wires, one with electricity and the other without. 2. a single black wire with electricity. 3. three red wires in a clamp solved in the ceiling cavity. There no electricity in any of the black wires when the light switch is off. I connected the pair of blacks to the live and the single black to the neutral but no cigar. Any advice will be appreciated