Today were going to be taking a look at the pollak heavy duty 4 pole round pin trailer wiring socket park number pk11404. The four wires control the turn signals brake lights and taillights or running lights.

4 Way Flat Wiring Diagram Wiring Diagrams
4 way round trailer wiring diagram. You will need to use a circuit tester part 40376 and find out which pins presently transmit which functions. Check with a test light or vom. My towing cable wires colors are green red brown and yellow can you show or explain the way to connect it to connector. 6 way systems round plug. 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. Custom wiring is the ideal solution for installing trailer light wiring on your vehicle.
You can find a diagram on the site to help make sure that youve got. One way to check for faulty wires is to use a circuit tester. The black sometimes red 12v and blue electric brakes wire may need to be reversed to suit the trailer. As the name implies they use four wires to carry out the vital lighting functions. 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. 4 way trailer connectors are typically used on small trailers such as boat snowmobile utility and other trailers that that do not use brakes.
If it is not no amount of wiring will get the lights to work. Make sure that all cables are electrically conductive. In this video we go over how easy and fast it is to convert a 4 flat harness to a 7 way. Does your vehicle have a 4 flat trailer wiring harness but you need to tow a trailer with a 7 way harness. They also provide a wire for a ground connection. 4 way trailer connectors are.
The first thing you need to do is make sure that your connector works properly. Unfortunately there is not an industry standard wiring configuration for the 4 way round trailer connector part pk11409. Wiring diagram recommendation for 4 way round trailer connector question. Installing your 4 pin trailer wiring system is easy if you follow the correct procedure.