Connecting 13-PIN connector

The 13-PIN connector is the current standard for electrical connection between vehicles and modern, state-of-the-art 12V semi-trailers. This connector combines all the essential functions of the older 7-PIN N and S systems in one robust and waterproof connection.

There are two common physical designs that comply with this standard (ISO 11446):

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 the physical shape, both 13-PIN connectors provide all the basic lighting and additional functions needed for modern, complex semi-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 12V semi-trailers, horse semi-trailers, boat semi-trailers.

13-PIN connector wiring diagram:

13-PIN Multicon West wiring diagram:

When is a 13-PIN connector used?

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

• Caravans with refrigerator or interior lighting
• Horse semi-trailers with interior lighting
• Semi-Trailers with reversing lights
• Boat semi-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.

Use of adapters between 7- and 13-PIN

When vehicle and semi-trailer have different connections, an adapter may be required:

• Vehicle with 13-PIN connector → semi-trailer with 7-PIN connector.
• Vehicle with 7-PIN connector → semi-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 see our CAN-bus solutions or this explanation of 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

• Practical for older semi-trailers with a 7-PIN connection.
• Can be found on various non-German vehicles and semi-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 manufacturers and resellers. The most common problem concerns power supply: many EVs deactivate the pins for constant current (PIN 9) and ignition switched current (PIN 10) or severely limit the current on these active pins due to strict power management.

Related articles

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