Extension cable Intermediate cable – Reliable Trailer Wiring Solutions
Extension cable Intermediate cable products are essential for extending and connecting trailer wiring systems. Whether you need an extension lead, connector cable, linking cable, or coupling cable, these solutions ensure a secure and efficient power transfer between your towing vehicle and trailer.
- ✔ Flexible installation for various trailer types
- ✔ Secure trailer wiring extension for uninterrupted connectivity
- ✔ Durable materials for long-lasting performance
- ✔ Simple to connect and disconnect as needed
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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
Extension cable Intermediate cable solutions are designed to provide reliable connections between vehicles and trailers. These products, including extension leads, connector cables, and linking cables, bridge the gap where standard wiring falls short. Their robust construction ensures safe power transmission for lighting, signaling, and other electrical needs on the road.
Key Features & Benefits
Each extension cable or coupling cable is engineered for optimal durability and flexibility. The high-quality insulation and connectors protect against moisture, corrosion, and mechanical stress, ensuring a stable connection in all weather conditions. Trailer wiring extensions are easy to handle, offering quick installation and removal without specialized tools. This reliability minimizes downtime and maximizes safety during transport.
Selection Guide
When choosing an extension cable intermediate cable, consider the required length and the type of connection needed for your trailer setup. Options include intermediate cables with dual plugs for seamless integration, as well as extension cables designed for specific wiring configurations. Assess your trailer’s electrical requirements to select the most compatible linking cable or connector cable, ensuring hassle-free operation.
Applications
These products are suitable for a wide range of trailers, from utility and cargo models to specialized transporters. Use a trailer wiring extension to bridge distances between towing vehicles and trailers or to connect additional accessories. Whether for commercial or personal use, extension leads and coupling cables deliver the dependable connections necessary for safe, legal, and efficient trailer operation.
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