Trailer wiring can be complicated, but with the right diagram, it doesn’t have to be. If you’re looking for a reliable source of information on the 13 pin trailer plug wiring diagram picture, you’ve come to the right place.
What is a 13 Pin Trailer Plug and Why is it Important?
Before we get into the specifics of the wiring diagram, let’s take a moment to understand what a 13 pin trailer plug is and why it’s necessary. In simple terms, a 13 pin trailer plug is a type of connector that allows your vehicle to communicate with a trailer. It’s become increasingly popular in recent years as a more advanced solution to the traditional 7 pin plug.
The 13 pin plug provides more features and functions, including additional power supplies and data communication capabilities. This makes it ideal for modern trailers, which often require more power and come equipped with advanced technology such as reversing cameras and sensors.
Now that we understand the importance of the 13 pin trailer plug, let’s take a closer look at the wiring diagram structure.
13 Pin Trailer Plug Wiring Diagram Structure
The 13 pin trailer plug wiring diagram consists of 13 pins, each of which is assigned a specific function. These functions range from powering the trailer’s lights and brakes to providing a connection for a fridge or caravan battery.
| Pin Number | Function | Colour (Cable) |
|---|---|---|
| 1 | Reversing light | Yellow |
| 2 | Auxiliary power (pin for fridge) | Blue |
| 3 | Earth return | White |
| 4 | Right-hand direction indicator | Green |
| 5 | Left-hand direction indicator | Brown |
| 6 | Stop lights | Red |
| 7 | Lamps/side marker lights | Black |
| 8 | Battery charging | Pink |
| 9 | Auxiliary power (pin for caravan battery) | Grey |
| 10 | Ground (standard for vehicle electrical system) | White |
| 11 | Ground (for ABS/EBS) | White/black |
| 12 | Ignition switch power supply | Orange |
| 13 | Ground (for ABS/EBS) | White/red |
The wiring diagram can seem overwhelming at first, but it’s actually fairly simple once you break it down. Let’s take a closer look at each of these pins and their functions.
Pin 1: Reversing Light
The first pin on the 13 pin trailer plug is designated for the reversing light. This pin is typically wired to the reversing light on the trailer, which will illuminate when the vehicle is put into reverse. The cable for this pin is typically yellow.
It’s important to note that not all trailers may have reversing lights. If your trailer does not have reversing lights, this pin may be left unconnected.
Pin 2: Auxiliary Power (Pin for Fridge)
The second pin on the 13 pin trailer plug is designated for auxiliary power, typically for a fridge or other accessory. This pin is wired to the power supply for the accessory and is typically coloured blue.
Pin 3: Earth Return
The third pin on the 13 pin trailer plug is designated for the earth return. This pin provides a grounding connection for the trailer’s electrical system and is typically wired with white cable.
Pin 4: Right-Hand Direction Indicator
The fourth pin on the 13 pin trailer plug is designated for the indicator light on the right-hand side of the trailer. This pin is typically wired with green cable.
Pin 5: Left-Hand Direction Indicator
The fifth pin on the 13 pin trailer plug is designated for the indicator light on the left-hand side of the trailer. This pin is typically wired with brown cable.
Pin 6: Stop Lights
The sixth pin on the 13 pin trailer plug is designated for the trailer’s stop lights. This pin is typically wired with red cable and will illuminate whenever the brake pedal is pressed.
Pin 7: Lamps/Side Marker Lights
The seventh pin on the 13 pin trailer plug is designated for the lamps and side marker lights on the trailer. This pin is typically wired with black cable.
Pin 8: Battery Charging
The eighth pin on the 13 pin trailer plug is designated for battery charging. This pin is typically wired to the battery charging system in the vehicle and is coloured pink.
Pin 9: Auxiliary Power (Pin for Caravan Battery)
The ninth pin on the 13 pin trailer plug is designated for auxiliary power, typically for a caravan battery or other accessory. This pin is wired to the power supply for the accessory and is typically coloured grey.
Pin 10: Ground (Standard for Vehicle Electrical System)
The tenth pin on the 13 pin trailer plug is designated for grounding the standard vehicle electrical system. This pin is typically wired with white cable.
Pin 11: Ground (for ABS/EBS)
The eleventh pin on the 13 pin trailer plug is designated for grounding the ABS (Anti-lock Brake System) or EBS (Electronic Brake System) on the trailer. This pin is typically wired with white/black cable.
Pin 12: Ignition Switch Power Supply
The twelfth pin on the 13 pin trailer plug is designated for the ignition switch power supply. This pin is typically wired with orange cable and provides power to accessories such as the radio and air conditioning.
Pin 13: Ground (for ABS/EBS)
The thirteenth and final pin on the 13 pin trailer plug is designated for grounding the ABS or EBS on the trailer. This pin is typically wired with white/red cable.
FAQs
What if my trailer doesn’t have reversing lights?
If your trailer doesn’t have reversing lights, simply leave pin 1 on the 13 pin trailer plug unconnected.
What if I need more power for accessories?
If you need more power for accessories, you can use pins 2 or 9 on the 13 pin trailer plug for auxiliary power. These pins provide a reliable power source for accessories such as fridges, caravans, and other devices.
What if my trailer has different coloured cables?
While the colours listed in the wiring diagram are the most common, it’s important to note that different trailers may have different coloured cables. Always double-check the wiring diagram for your specific trailer to ensure proper wiring.
Can I use a 7 pin plug with a trailer that requires a 13 pin plug?
No, you cannot use a 7 pin plug with a trailer that requires a 13 pin plug. The two plugs are not compatible and attempting to use one with the other could result in damage to your trailer’s electrical system.
Can I wire the plug myself?
If you have experience with vehicle electrical systems, you may be able to wire the 13 pin trailer plug yourself. However, if you’re unsure or feel uncomfortable with the process, it’s always best to seek the services of a professional.
As always, safety should be your top priority. Never attempt to wire your trailer’s electrical system unless you have the proper knowledge and experience.
With the right wiring diagram and a bit of knowledge, wiring your 13 pin trailer plug can be a straightforward process. Whether you’re towing a caravan or a trailer full of equipment, having a reliable electrical connection is essential for a safe and successful journey.
