My lighting in the backyard works, doesn't work in the front. When I cut the wires and was going to splice them back - I noticed one of the wires is "dusty" inside....not copper looking like the other side. will it still work or does it need to be replaced?

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It is not unusual to see corrosion inside of copper wire at the connections.  Just clean off the corrosion and splice the wires using a wirenut filled with silicone sealant.  This will prevent water from causing the same problem.

Should you need some new landscape lighting wire or want to expand your outdoor lighting system, I trust that you will visit your friends at Residential Landscape Lighting & Design.  Good luck on the repairs and thanks for the question.

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