Nilight 16 Feet Trailer Wiring Harness To Allow Multiple Towing Configurations. Not All Trailer Wire Colors Are Made The Same, Ensure You Look At The Wire Color Guide. Thick Gauge Copper Wire Ensures A Constant & Reliable Connection. The Best Peace Of Mind On All Your Towing Adventures. Perfect for connecting tail, brake, reverse, turn signals and auxiliary power of your trailers, RVs, campers, caravans, food vans and other towed vehicles. Please read the diagram carefully before any operations on the product.