Just keep in mind that wiring is a custom component. The colors for wiring a 7 way connector are as follows with the 4 colors of the 4 way connector remaining the same.

4 Way Flat Wiring Diagram Wiring Diagrams
Trailer connector wiring diagram 4 way. 6 way systems round plug. You have it right so far the 4 way connector is just as you have stated. If it is not no amount of wiring will get the lights to work. This car is designed not only to travel 1 location to another but also to carry heavy loads. The first thing you need to do is make sure that your connector works properly. Simply plug the trailer end connector into the vehicle end connector and youre ready to roll.
The basic purpose remains the same whether your truck and trailer is using a 4 way 5 way 6 way or 7 way connector. By law trailer lighting must be connected into the tow vehicles wiring system to provide trailer running lights turn signals and brake lights. The black sometimes red 12v and blue electric brakes wire may need to be reversed to suit the trailer. Trailer electrical connectors come in a variety of shapes and sizes. This report will be discussing 4 way wiring diagram trailer. 4 way wiring diagram trailer 4 way flat trailer plug wiring diagram 4 way flat trailer wiring diagram 4 way round trailer plug wiring diagram folks understand that trailer is a car comprised of quite complicated mechanics.
Installing your 4 pin trailer wiring system is easy if you follow the correct procedure. Remember that yellow has a l in it so that is the left side braketurn signal and green has a r in it so that is the right side braketurn signal. If your vehicle does not have a 4 way connector its usually pretty simple to add one. Round 1 14 diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights auxiliary 12v power or electric brakes. One way to check for faulty wires is to use a circuit tester. Make sure that all cables are electrically conductive.
A custom wiring harness or t connector is a vehicle specific harness that plugs in without any spicing required and provides a standard connector output such as a 4 way flat. Prepare for vehicle wiring installation if your vehicle already has a 4 way connector then great. Check with a test light or vom. Custom wiring is the ideal solution for installing trailer light wiring on your vehicle.