If you’ve ever owned or used a trailer, you know how important it is to have a properly wired trailer plug. The 5 pin flat trailer plug is a commonly used connector in North America, and it’s vital to know how to wire it properly. In this article, we’ll provide you with a detailed wiring diagram and explain each pin’s function. Additionally, we’ll answer some frequently asked questions about the 5 pin flat trailer plug.
Wiring Diagram for 5 Pin Flat Trailer Plug
Before we dive into each pin’s function, let’s start by looking at a wiring diagram for the 5 pin flat trailer plug:
| Pin Number | Wire Color | Function |
|---|---|---|
| 1 | White | Ground |
| 2 | Brown | Tail Lights |
| 3 | Yellow | Left Turn/Brake Lights |
| 4 | Green | Right Turn/Brake Lights |
| 5 | Blue | Electric Brakes |
It’s important to note that some manufacturers may use different wire colors for the same function, so always refer to the wiring diagram provided by your trailer and/or vehicle.
Pin Functions Explained
Pin 1: White Wire (Ground)
The white wire is the ground wire and is essential to properly ground the trailer’s electrical system. A good ground connection ensures the trailer’s lights and brakes work correctly. This wire should be connected to the trailer’s frame or a grounding point near the trailer’s plug.
Pin 2: Brown Wire (Tail Lights)
The brown wire connects to the trailer’s taillights and illuminates them when the vehicle’s headlights are turned on. This wire provides necessary lighting to the rear of the trailer and alerts other drivers of its presence.
Pin 3: Yellow Wire (Left Turn/Brake Lights)
The yellow wire is used to power the left turn signal and brake lights. It connects to the left-side brake light and turn signal, creating a flashing effect when activated. This wire is crucial for safe driving, as it signals when the trailer is turning or stopping.
Pin 4: Green Wire (Right Turn/Brake Lights)
Like the yellow wire, the green wire also powers the turn signal and brake lights. However, it connects to the right side of the trailer, providing flashing signals when the vehicle is turning or stopping to the right. It’s important to note that the left and right turn/brake lights should be wired separately to avoid any electrical interference.
Pin 5: Blue Wire (Electric Brakes)
The blue wire is used to connect the trailer’s electric brakes to the towing vehicle. It sends the necessary electrical signal to activate the brakes when the vehicle’s brakes are applied. This wire is optional but recommended for trailers with electric brakes.
FAQs
What is a 5 pin flat trailer plug?
A 5 pin flat trailer plug is a wiring connector commonly used in North America. It has five pins that connect the trailer’s electrical system to the towing vehicle’s system.
What’s the difference between a 4 pin and 5 pin flat trailer plug?
The main difference between a 4 pin and 5 pin flat trailer plug is that the 5 pin has an additional blue wire used for electric brakes. The 4 pin lacks this wire and is often used for smaller trailers without electric brakes.
How do I test my trailer’s wiring?
Testing a trailer’s wiring is easy with a simple circuit tester. First, connect the tester to the vehicle’s battery or power source. Then, connect the tester to each pin on the trailer plug and verify that each wire is correctly functioning by using the tester’s lights or sound signals.
What wire gauge should I use for my trailer’s wiring?
The wire gauge for your trailer’s wiring depends on the maximum current draw of your trailer’s electrical components. Generally, for lighting and small accessories, a 16-gauge wire is sufficient. For electric brakes or larger accessories, a thicker wire, such as 12 or 14-gauge, may be needed.
Can I wire a 5 pin flat trailer plug myself?
Yes, wiring a 5 pin flat trailer plug is a straightforward process, as long as you follow the wiring diagram and use proper wiring techniques. However, if you’re unsure about your wiring abilities, it’s always best to consult a professional.
Now that you know how to wire a 5 pin flat trailer plug, you can safely and confidently use your trailer for all your hauling needs. Remember to always refer to your trailer and/or vehicle’s specific wiring diagram to ensure proper wiring connections.
