13-pin trailer plug wiring diagram

On this page, you will find the wiring diagrams for 13-pin Jaeger and Multicon West trailer plugs. Each diagram shows the pin configuration, wire colours and corresponding lighting functions. The 13-pin trailer plug is commonly used for trailers and caravans that require additional electrical functions compared with a 7-pin connection.

The two most common 13-PIN connectors:

1. The Jaeger plug: This is the most common modern variant, characterised by a bayonet connection that ensures a solid and secure connection.
2. The Multicon West connector: This is an older but still used variant that has the unique feature of being directly compatible with the old 7-PIN connectors (by using the PINs in a different order).

Regardless of their physical shape, both 13-PIN connectors provide all the basic lighting and additional functions required for modern, complex trailers.

Unlike the 7-PIN connector, the 13-PIN variant offers additional features such as:

• Reversing lights
• Constant power supply
• Ignition current
• Battery supply for refrigerator or internal lighting

This makes the 13-PIN connector the ideal choice for modern trailers, horse trailers and boat trailers.

13-PIN TRAILER PLUG WIRING DIAGRAM

Download the Jaeger wiring diagram as a PDF

13-PIN Multicon West wiring diagram:

Download the Multicon West wiring diagram as a PDF

When is a 13-PIN connector used?

The 13-PIN connector is standard on modern vehicles and trailers that require additional power supplies. Applications include:

• Caravans with refrigerator or interior lighting
• Horse trailers with interior lighting
• Trailers with reversing lights
• Boat trailers with additional light functions

A 13-PIN connection is available in almost all new European vehicles and is also the recommended solution for aftermarket towbar kits.

Application in trailer lighting

This wiring diagram is used in trailer lighting where, in addition to the basic functions, extra connections are required. The connector connects the vehicle side and the trailer side within a single lighting system. Consequently, a fault in the connection can quickly affect multiple functions. In the comprehensive guide to trailer lighting, you can read more about surface mounting, application and choice of system.

Using adapters between 7-pin and 13-pin trailer plugs

If the vehicle and trailer have different connections, an adapter may be required:

• Vehicle with a 13-PIN connector → trailer with a 7-PIN connection
• Vehicle with 7-PIN connector → trailer with 13-PIN connection

Please note: when using an adapter from 13 to 7, the additional functions are not supported. Only the basic lighting (as with a 7-PIN connector) remains active.

CAN-bus interference with 13-pin connections

Modern vehicles are often equipped with a CAN-bus system that is sensitive to deviating current values. This can result when connecting LED lighting via a 13-PIN connector:

• Lighting not working
• Flashing lights
• Dashboard messages
• Lighting that stays on after uncoupling

Solution: use special CAN-bus-compatible modules, or take a look at our CAN-bus solutions or this guide to interference.

Two variants: Jaeger and Multicon West

There are two versions of the 13-PIN connector in circulation: Jaeger and Multicon West. They are not interchangeable and differ in design and compatibility:

Jaeger plug (DIN standard).

• Used as standard with German car makes such as Mercedes-Benz, Audi, Volkswagen and BMW.
• Has a bayonet connection for a firm and waterproof connection
• Does not fit 7-PIN connectors without adapter.
• Please note: never leave an adapter plugged in for long periods - this increases the risk of moisture infiltration

Multicon West connector

• Useful for older trailers with a 7-PIN connection
• Found on various non-German vehicles and trailers
• Fits both 7- and 13-PIN connections, ideal for mixed applications.
• Please note: does not fit Jaeger junction boxes - and vice versa.

13-PIN connector on electric vehicles (EVs)

The transition to electric vehicles (EVs) leads to specific challenges with the 13-PIN connector that are crucial for semi-trailer builders and resellers. The most common problem concerns power supply: many EVs deactivate the pins for constant current (PIN 9) and contact switched current (PIN 10) or severely limit the current on these active pins due to strict power management.

Other connectors and wiring diagrams

• 7-PIN connector (12V).
• 7-PIN connector (12v).
• CAN-bus solutions for LED lighting

Problems connecting trailer lighting

Many faults are caused by incorrect pin configuration, poor mass connection, corrosion in the connector or differences between the vehicle and trailer cabling. Particularly with 13-PIN systems, variations and additional functions can more easily lead to discrepancies. Read more here about connecting trailer lighting.