If you need to hook up a trailer this is the harness you need. The wire is all copper and works very well to connect my trailer lights to my truck when I pull on it. With 30 feet of wire, there should be enough wire for almost any size trailer, and the wires should stay put. The 4 prong end is molded rubber and I would assume the prongs are electroplated copper but I am not 100% sure if they are copper but I can say that this connector and cord set for worked very well for me on my work trailer.
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