Does your trailer have a 4-pin connector or a 5-pin connector? If 4-pin, the lights work as combination brakelights and turn signals (as well as running lights). If 5-pin, the brakelights and turn signals are separate. This will all affect your adapter or wiring. For a 5-wire trailer, you will need the 2010 9-pin Tongue harness (P/N 710002029), if it is still available. This is set up for 6-wire use (actually it has 7 wires), with separate left and right brakelights, but you need to select just one or the other. For a 4-wire trailer, you need the 2011 Pole Harness (P/N 710002442). This has 4 wires, and will not work with a 5-wire trailer. I hope you ordered the right harness. If the harness and your trailer do not match up, you could rewire your trailer. BTW, you need not make an adapter if you don't need to use the trailer with anything else, or don't use multiple trailers. You can cut off the original trailer connector, and wire the 9-pin harness directly. Be sure and leave a sufficient length of wire, or build a long enough adapter. The Spyder trailer connection is farther than normal from the trailer ball.