Headcheese, what you'll find is a standard connecton with the 6-round. You should of got a matching plug with the coach, if not, you can get one from any rv dealer/camping world store.
Now for the connections. The two pins that are not used are marked as 'S' and 'A'. The 'S' pin will be on the outside and the center pin will be the 'A' pin. These are used when you install a brake controller, remco pump control, etc. The remaining 4 pins are ground, TM, RT, & LT.
If you have yellow turn signals then you will need to add what is called a 3 to 2 converter. This combines the seperate brake signal to come out on the LT & RT signal wires. Now for color codes. Most RV dealers and CampingWorld locations use the follow for standard 4 wire connections. Ground=White, LT=Yellow, RT=Green, and TM=Brown. TM is your running lites, marker lites, etc. I forgot to mention that if you do not have yellow turn signals on the coach, then NO 3 TO 2 convertor is required.
If your only towing a car, you will only will need 4 wires to the car. A 4-flat wire cable which will have White,Brown,Yellow,Green wires. How you connect to the 4-round will be determined how the mating connector is wired on the car. This you will need to figure out. Once you ID what wire goes where, then you can connect the correct pin to the corresponding wire to the 6-round connector.
I hope I didn't confuse you. It's fairly simple. Good luck.
Renegade (Jim) & Wrangler (Doreen)
& 4 attack cats, TJ, Shadow, Chessie, RJ
along with 2 who adopted us, Tom & puddy.