Choosing The Right Wiring Kit

When you decide to have a towbar fitted, it is very import to choose the right wiring kit. The right wiring kit will protect the investment you have made in your vehicle, caravan or trailer. Safety should always be the number one priority. Jacques Towbar Services offer two different towbar wiring options – the CANbus system, or Univeral Bypass relay. Below is our handy guide to help you choose the best option for your vehicle.


Vehicle Specific Wiring Kit

vehicle_specific_wiring_loomThe latest in smart technology is the CANbus system. This system facilitates the interaction of different wiring and computer systems, and the detection of a trailer or caravan connection. Computers with advanced sensors and features monitor the safety and stability of both the towed and towing vehicles. They enable the driver to automatically switch off the rear fog lights and parking sensors.

A Trailer Stability Program will operate automatically when sensors detect changes in operational conditions and caravan or trailer connection:

  • Lane change assistant
  • Brake electronics
  • Adaptive cruise control
  • Suspension system (ASS)
  • Engine electronics
  • Engine cooling system
  • Parking aids
  • Reversing cameras



  • Approved by All Vehicle Manufacturers
  • Vehicle warranty protected
  • Trailer Stability Control and vehicle safety features activated
  • Parking aids and vehicle fog light disabled while towing



  • Higher cost



Universal Bypass relay

universal_BypassThis is a very popular option because the towing electrics are separated from the in-car wiring system. This electrical installation is commonly called ‘By-pass electrics’. This system is used to protect the car’s lighting systems from potential damage if the wiring in a trailer should malfunction. It is a tried and tested system in common use.

Due to the complexity of newer vehicles, this option is not recommended by vehicle manufacturers with an existing warranty.



  • Lower price
  • Universal fitment



  • Not approved by manufacturers
  • Vehicle Safety features not activated
  • Trailer Stability Control not activated
  • Parking aids are not disabled while towing
  • Might affect your vehicles warranty