Sockets Couplings for Secure Trailer Connections
Sockets couplings are essential components for establishing safe and reliable electrical connections between your towing vehicle and trailer. Whether you need socket connectors, hitch couplings, trailer joint adapters, or tow bar sockets, our selection ensures compatibility for various trailer types and requirements.
- ✔ Wide range of coupling fittings for 7-pin and 13-pin systems
- ✔ Durable materials like PVC, aluminium, and steel for long-lasting use
- ✔ Easy installation with included accessories and mounting options
- ✔ Seals and holders available for enhanced protection and stability
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Frequently Asked Questions
7-pin plug (Type N, ISO 1724) — the older standard:
| Pin | Terminal | Colour according to DIN | Function |
|---|---|---|---|
| 1 | L | yellow | Left direction indicator |
| 2 | 54G | blue | Rear fog light |
| 3 | 31 | white | Ground |
| 4 | R | green | Right-hand direction indicator |
| 5 | 58R | brown | Right-hand rear light |
| 6 | 54 | red | Brake light |
| 7 | 58L | black | Left rear light and number plate light |
13-pin plug (ISO 11446) — current standard, with additional functions and separate earth connections:
| Pin | Colour according to DIN | Function |
|---|---|---|
| 1 | yellow | Left direction indicator |
| 2 | blue | Rear fog light |
| 2a | — | Switch for rear fog light on the vehicle |
| 3 | white | Earth (circuits 1–8) |
| 4 | green | Right-hand direction indicator |
| 5 | brown | Right-hand tail light, side marker light and number plate light |
| 6 | red | Brake light |
| 7 | black | Left tail light, side marker light and number plate light |
| 8 | orange | Reversing light |
| 9 | red, 2.5 mm² | Direct power supply (terminal 30) |
| 10 | black-red | Battery charging lead |
| 11 | green-brown | Earth for charging cable |
| 12 | — | not assigned |
| 13 | white, 2.5 mm² | Earth for circuit 9 |
The numbering stamped on the plug and socket is binding — for cable sets with different numbering, this applies rather than the wire colours.
Adapter: Converting from a 13-pin connector on the vehicle to a 7-pin connector on the trailer is straightforward. Conversely, only the basic functions will work — the reversing light, constant power supply and charging circuit are missing, as there are no corresponding wires in the 7-pin system. Disconnect the adapter when not in use, otherwise the contacts will corrode.
If the lighting fails, it is usually not the bulb that is faulty, but the connection to it. Check in the following order:
- Contacts in the plug and socket — corrosion is the most common cause. Clean, dry and apply contact cleaner.
- Earth — is the connection to the frame secure and rust-free? If several functions fail at the same time, the earth connection is almost always to blame.
- Cables on the drawbar — this is where cables most often chafe through, often directly behind the plug.
- Bulbs and lights — only once everything else has been checked.
Conversion to LED: Lights must have a valid approval mark. After conversion, the trailer monitoring system in the towing vehicle may no longer be able to detect the trailer because the current flow is too low — in which case a suitable control unit will help.
Spare parts: electrical components, plugs and cables, as well as lighting.
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Product Overview
Our sockets couplings category features a comprehensive range of socket connectors, hitch couplings, trailer joint adapters, and tow bar sockets designed for both car trailers and caravans. The assortment includes 7-pin and 13-pin coupling fittings, robust socket holders, seals, and screw sets. Each product is engineered for compatibility with standard trailer plugs, ensuring seamless integration and secure connections for your towing needs.
Key Features & Benefits
Every coupling fitting in this category is crafted from high-quality materials such as PVC, aluminium, and painted steel, providing excellent durability and resistance to wear. The selection includes sockets with and without switch-off contact for rear fog lights, allowing for tailored solutions based on your trailer’s electrical system. Seals in both oval and round designs offer reliable protection against moisture and dust, while angled socket holders and screw sets simplify installation and maintenance.
Selection Guide
Choosing the right sockets couplings depends on your trailer’s electrical configuration and intended application. For newer trailers or caravans, 13-pin socket connectors with switch-off contact are ideal, supporting advanced lighting and safety features. Traditional 7-pin hitch couplings are suitable for basic lighting needs. Consider the material—aluminium housings provide extra robustness, while PVC options are lightweight and corrosion-resistant. Don’t forget to select compatible seals and holders to ensure a secure, weatherproof installation.
Applications
These sockets couplings and related accessories are suitable for a wide range of applications, including car trailers, caravans, and utility vehicles. Whether you’re upgrading an existing trailer joint adapter, replacing a worn tow bar socket, or installing new coupling fittings, our products deliver dependable performance in everyday and demanding towing situations. Ensure your trailer’s electrical systems are connected safely and efficiently with our expert selection of sockets couplings.
Find the right option now and order online.
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