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Complete with a color coded trailer wiring diagram for each plug type, this guide walks through various trailer wiring installation solution, including custom wiring, splice-in wiring and replacement wiring. If your vehicle is not equipped with a working trailer wiring harness, there are a number of different solutions to provide the perfect fit for your specific vehicle. Trailer Hitch Parts The draw bar slides into the receiver's square hole and a pin is inserted through the side, moving thru the hitch and the bar to hold the bar securely in place. One of the benefits of a receiver style trailer hitch is the option to remove the draw bar when the hitch isn't being used, in order to eliminate the extra length it. I spoke with my contact at Curt and found that they do not have a diagram or installation instructions for installing the Curt Coupler Repair Kit, # C25194.I did pull the repair kit from my warehouse and made a video showing how to assemble the repair kit. Trailer Wiring Diagrams Trailer Wiring Connectors. Various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller, backup lights, or a 12V power supply for a winch or interior trailer lights. U-Haul is North America's #1 hitch installer. With over 1,500 install locations, we can guarantee you'll find a location near you. Tell us your vehicle year, make and model and we will show you available trailer hitches and related towing components. In addition to hitches, there are a number of trailer hitch accessories that can make hauling trailers easier and safer Hitch installation accessories These make it easier for you to install hitches through difficult access points, such as enclosed frames. Works great on E Trailer and Ram couplers and many other styles of straight tongue couplers with the same ball size and capacity. This is what the repair kit for our coupler's going to look like. A hitch pin is a small metal rod that keeps a ball mount shank and other trailer hitch parts from sliding out of a hitch receiver tube. Typically, a hitch pin is bent in an "L" shape. It is designed to insert into the side of the hitch receiver, pass through the ball mount shank and come out the other side. CURT 45030 Class 3 Trailer Hitch Ball Mount, Fits 2-Inch Receiver, 7,500 lbs, 1-Inch Hole, 2-In Drop, 3/4-Inch Rise 4.8 out of 5 stars 297 $12.60 $ 12 . 60 $20.74 $20.74. Trailer Wiring Diagram. To connect the electric system of your trailer to the vehicle, you will be using special connector. Above we have describes the main types of trailer wiring diagrams. Below is the generic schematic of how the wiring goes. 4 pin trailer wiring diagram.