7 pin trailer plug - IOT Wiring Diagram

A 7-pin trailer plug is a device used to secure a trailer to the towing vehicle. Commonly used for large vehicle trailers such as caravans, boats, livestock, or horseboxes, a 7-pin trailer plug is essential for safe and secure towing. As The AA explains, “It's important to choose the correct type of socket for your trailer; the wrong one won't fit or it could be unsafe. Look for the label ‘7-Pin Plug’”

Using a 7-pin trailer plug is easy. First, check that the trailer has been securely attached to the towing vehicle. Second, attach the 7-pin trailer plug to the rear of the vehicle. The plug will have an electrical earth connection which should be connected first. Third, connect the remaining six pins in the correct order. The order is often printed on the plug or the back of the vehicle so refer to in the vehicle manual if in doubt. A standard 7-pin trailer plug will have the following connections: left brake, right brake, tail lights, number plate light, interior lights, and auxiliary.

Finally, once the plug is attached to both the vehicle and trailer, the trailer’s brakes, signal lights, reverse lights, and other electrical components can be tested. It’s advisable to engage a qualified auto-electrician to perform the installation and testing process, to ensure everything is working correctly and safely. With the right tools and credentials, a 7-pin trailer plug can be installed quickly and easily, allowing you to enjoy the safety and security of towing with peace of mind.

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