Twin 7 Pin 12n 12s Electric Towbar Towing Wiring Kit Charging 7way bypass relay




This is a 12n & 12s wiring kit complete with TEB7AS & TEC3M Charging relay.

Kit includes:

1 x Pre-wired 12n & 12s sockets with double socket plate attached and 2 metres of cable.

1 x TEB7AS bypass relay with audible bulb failure warning.

1 x TEC3M Charging relay.

7 x Scotch locks.

4 x Ring terminals.

4 x Female spade terminals.

2 x 6m of battery cable for live connection.

1 x Earth cable for TEC3M.

2 x Fuse holder & Fuse.


Can be used with either plain or modulated 12 volt circuits

This relay is an essential piece of kit on modern multiplex and Cambus equipped cars to prevent damage to lamp control units & ECU’s

How the TEB7AS works

Modern cars have very sophisticated bulb failure and lamp control systems that constantly monitor the current consumption in individual wires – if you connect tow bar wiring straight on to the loom the computers can shut down, put on warning lamps or in some cases burn out!!

The TEB7AS relay draws only a tiny amount of power from the loom to trigger the internal relay banks – the main output power to the tow bar socket is provided from the 12-volt permanent relay power – this prevents the car from detecting the presence of the tow bar electrics and also protects the cars circuits as any short or problem with the trailer electrics will blow the fuse for the relay – not an expensive ECU!


Full fitting instructions for the TEB7AS & TEC3M are available on request, either call us on 01254 681953 or e-mail. Should you need technical support please quote the eBay/PayPal transaction reference number.


We also sell other complete fitting kits with cables & sockets – please check our other listings!!

Orders placed before 12am weekdays will usually be posted same day


Fully EC approved for electromagnetic compatibility

Hundreds of other towing accessories available please email us your requirements


We are official parts stockists for: Knott – Avonride, Bradley – Dixon-Bate, Alko-Kober , Maypole and Aspock lighting systems.

We are UK official importers for Lider trailers and Lancashire stockist for and Brian James Trailers we also stock Meredith and Eyre trailers.

A full vat invoice can be supplied – please add a note to your order if you require one.

If we do not list the part you require please email or phone.

We also accept payment by credit/debit card please call us to arrange.

Carriage is by courier and MUST BE SIGNED FOR – we will aim to despatch the same day on pre noon orders, otherwise despatch is next working day.

Returns are no problem – please contact us within 30 days to arrange, upon receipt of the goods (in an unused condition) we will credit you in full minus the original carriage cost.

Buy with confidence from a NTTA Quality secured towbar and trailer centre


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