Installing 2 low voltage cabinet lights.The cabinets are on opposte sides of the sink.Above each cabinet I have a 12/2 wire coming out near the ceiling each is hot.Switch is on the wall.I can add up to 3 light fixtures with the one transformer.Each light has 2 wires,one red one black.Can I wire the 2 lights on opposite sides to the same transformer using the wires that I have in place?I think I need a "third wire'.Or another transformer.Am I right? What am I missing?
To clarify...you have one wire over each of your two cabinets, for a total of two wires. Both wires are controlled by a single switch. You are asking whether one transformer, connected to one of the two wires, can be used to power lights on both sides of the windows, without running additional wires between the two cabinets?
I believe the answer is no. You will need transformers on both cabinets.