Hi, I am replacing an old pull cord switch in my bathroom when I took the old one off there were 3red wires and 3 black wires. One red wire which comes from bulb was connected to com the other two reds went into L1 I put it back exactly as it was before but light wouldnt come on. I then put back the old one and that wouldnt work either. The black wires were not connected to anything and was wondering if anyone can help other than calling a sparky????