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Also known as: Trailer hitch electric kit, Trailer Electrics, Towbar Electrics, Trailer Hitch Electric Kit

OEM & aftermarket towbar wiring kit from top brands — compare prices, check fitment, order with free delivery

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Shop 11 towbar wiring kit from 5 trusted brands including ACPS-ORIS, Augustin Group, HELLA. Compare prices, check vehicle compatibility, and get free delivery on orders over £99.

Towbar Wiring Kit buying guide — what to know before you buy

Towbar wiring kits provide the electrical interface between the vehicle and a trailer or caravan socket. They include the loom, control module, and 7- or 13-pin socket. Most modern vehicles need a vehicle-specific module that integrates with the CAN bus to keep features such as trailer detection, reverse-camera switching, and parking sensor disable working.

When to replace

Replacement is required if the existing wiring is faulty, the socket is corroded, or the system needs upgrading from a 7-pin to 13-pin connection.

Trailer lights flickering or not illuminating
Vehicle dashboard warning of a trailer fault despite the trailer being correct
Corrosion inside the towbar socket
Upgrade from 7-pin to 13-pin for caravans with refrigerator or interior lighting
Adding a towbar to a vehicle that did not have one fitted from new

What to look for when buying

Modern vehicles are built around CAN bus electrical systems and require a coded interface module. Generic splice-in kits are no longer suitable for most cars made after 2008.

Vehicle-specific module — coded for your make, model, and chassis
Bypass relay required on some non-coded vehicles to protect circuits
7-pin (Type N) or 13-pin (Type F or 12N+12S equivalent) socket
Some kits require dealer or specialist coding to enable trailer features
Confirm whether the kit supports trailer stability assist if your vehicle is fitted with it

Common failure modes

Towbar wiring is exposed to road spray, heat, and repeated unplugging. Failures are usually mechanical or environmental.

Corroded socket pins from water ingress
Trailer wiring fault triggering vehicle module errors
Splice-in connections degrading over time, causing intermittent lights
Module failure after a short circuit on the trailer side
Coding lost after a battery disconnection on some vehicles

Related parts to check together

When installing or replacing wiring, inspect the towbar hardware and the vehicle-side socket.

Towbar — check bolts, drop plate, and ball wear
Bypass relay module — replace if older type is fitted to a CAN bus vehicle
Vehicle-specific coding — book in for activation if the kit requires it
Trailer and socket — clean pins and check for moisture before pairing

Frequently Asked Questions

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Do I need a vehicle-specific wiring kit?

On most cars made after about 2008 yes — the body control module monitors light circuits and will flag faults on a trailer if the wiring is not properly integrated. Vehicle-specific kits are coded and avoid these errors.

What is the difference between 7-pin and 13-pin sockets?

7-pin (Type N) handles basic trailer lighting. 13-pin combines lighting with a permanent live and switched live for caravan refrigerators, interior lighting, and battery charging — required for most modern caravans.

Will fitting a towbar wiring kit affect my warranty?

A vehicle-specific kit fitted by a competent installer is normally accepted by manufacturers. Splice-in or bypass-relay kits on a CAN bus vehicle can void warranty on electrical faults — confirm with your dealer before fitting.