When it comes to safely and securely towing a trailer, it is absolutely essential to ensure that all four wires on the trailer plug are in working order. Having four wires is beneficial for several reasons; it ensures that the trailer has access to power and ground, brakes and turn signals. Properly connecting and maintaining these four wires can mean the difference between a successful towing experience and disaster.
The four wires of a trailer plug are often labelled similarly, with colours corresponding to their intended purpose. Generally, two wires will be for the running lights, usually in green and yellow. The two remaining wires will most likely be black or white, providing ground and power. The most important wire is the one that links the brakes and signal lights together and this is where understanding each colour code comes into play.
Finding the right fit for your trailer plug might take some trial and error. To ensure that the wiring is connected correctly, follow the instructions provided in the trailer manual. When connecting the wires together, make sure you use butt connectors approved for outdoor use. Once everything is connected, it’s essential to test the connections by turning on the brake lights, turn signals and headlights to ensure everything is working correctly. When done properly, the four wires of a trailer plug should provide you with safe and reliable trips every time.
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