There are numerous configurations of trailer wiring and each type has differing colors that correspond to different uses. ![]() Next up, we will discuss trailer wiring colors and explain which wires work for each function. If your trailer is equipped with electric brakes, be sure that the trailer wiring is compatible and functions in sync with your vehicle's braking system.Īuxiliary Power or Accessories Wiring works to power additional accessories such as power jacks, leveling systems, trailer sway controllers and even lighting and travel trailer power when in tow. Whether that be in a parking lot or at a boat dock, the reverse lights allow people and vehicles behind the trailer to know that you intend to move in reverse.Įlectric Trailer Brake Wiring is essential if you are towing a large or heavy trailer. Reverse Lights signal that you're backing up and are a crucial feature for safety when at a standstill. Running lights allow other drivers to know where your trailer begins and prevents accidents by providing visibility. Running Lights provide visibility in low-light conditions and function similarly to brake lights although they are not quite as bright. When traveling with a trailer, making turns or lane changes can be more difficult and it's important that other drivers are aware of your intentions long before you begin to maneuver. Turn Signals indicate your directional intentions to other drivers. Driving with brake lights is essential and driving without them can be dangerous. They also serve the purpose of allowing drivers to see the back of your trailer as they approach at nighttime. Trailer Brake Lights are vital for signaling to drivers behind you that you're slowing down or stopping. Each serves different purposes and features different parts and has different colors and numbers of wires.īelow, we'll explain what the parts of trailer wiring are and what they are used for. Trailer wiring comes in numerous different configuration types and styles that range from the most basic 4-flat pin connection to more advanced 7-way blade connections. Now that we're ready, let's dive into the different uses of trailer wiring. To clear up any confusion, however, trailer wiring is only the wiring harness itself and does not include secondary accessories that may be plugged or spliced into your trailer wiring harness. It's also important to understand your trailer wiring so that if you decide to buy a towing accessory, such as a trailer brake controller or sway controller, you know it is compatible with your setup. It is important to understand trailing wiring so that you know what type of trailer wiring to buy or how to repair your trailer wiring in the event a fault occurs. Without it you cannot tow safely or legally. Regardless of what you're towing, trailer wiring is essential. Trailer wiring systems vary from the most basic types of taillight converter kits to fully powered RV 7-blade plugs, from more basic uses such as towing a small utility trailer or a jet ski to towing a 30-foot 5th wheel travel trailer. Simply put, it's the "nervous system" of your trailer, controlling lights, brakes and other vital components. 4-Way ConnectorsĤ-Way connectors are available allowing the basic hookup of the three lighting functions (running, turn, and brake) plus one pin is provided for a ground wire.Trailer wiring describes the electrical harness that serves the various functions needed for towing a trailer. ![]() Not only will it display a clean look, but a mount is helpful in avoiding the potential problems associated with leaving a connector dangling. Also, mount the connector on the vehicle. Choose a connector that has the required number of pins for the functions required. Various connectors are available from four to seven pins to allow for the transfer of power for the lighting as well as auxiliary functions such as electric trailer brake control, backup lights, etc. To help in this task consult the owner’s manual or the chart at the bottom of the page. Hardwiring requires the installer to locate the proper wires in the tow vehicle. ![]() The T-One Connector is pre-wired to a 4-pole flat that can adapt to a 6 or 7 way round connector. This is accomplished through either a T-One connector (if available for your vehicle) or through hardwiring. To provide the power and a hook-up for these, the tow vehicle’s wires are tapped into. Trailers are required to have at least running lights, turn signals and brake lights.
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