Tow Car Wiring Help

[Headcheese]

Got a new 2005 Itasca Sunrise with a new 6 plug electric fitting tow car already installed. I have the tow car with a 4 plug electric fitting already installed. The car is wired up with only three wires, so do I go with the four plug wire harness from motorhome to car? Any ideas, besides take it in to a shop?

[Headcheese]

Got a new 2005 Itasca Sunrise with a new 6 plug electric fitting tow car already installed. I have the tow car with a 4 plug electric fitting already installed. The car is wired up with only three wires, so do I go with the four plug wire harness from motorhome to car? Any ideas, besides take it in to a shop?

[Hoverbug]

Sounds like your car is wired for lights only(running,brake & Turn). The extra wire from the motorhome would be for a brake accessory such as a Brake Buddy.

[MO _ Jack]

Sounds as if a standard adapter from 6, to 4 will work. most any RV supply house or trailer sales place should have them. I use one when I pull a ulity trailer.

Jack

[Renegades]

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.

Jim
RV tech

[Cruzer]

I would buy a 6 wire umbilical cord. Then I'd remove the 4 pin socket on the coach and replace it with a 6 pin socket. Now your pretty much standard.

You only need to connect 4 wires for now (right-left-tail-ground) but later on your going to want to add a tow brake system. At that time you may need the extra 2 wires so it's best to have them in place from the start so that you don't have to buy stuff twice.