I am replacing two outdoor light fixtures that are controlled by two switches. The second one was connected to the first one by a very thin, 3-connector(?) flat cable which is also being replaced. The first light when replaced by itself worked, but when I turned both switches on it now stops working. The old flat cable did not have colored wires, didnot help me with how the two lights were connected, except the middle wire was wired around the cable itself, or not used. How do I make sure I have them connected right and both to operate?