LED Fault Eliminator Fitting Instructions: How to Stop Trailer LED Warning Faults

LED trailer lights are now commonly used across caravans, plant trailers, utility trailers, horse trailers and commercial transport fleets because they are brighter, more durable and far more resistant to vibration than traditional bulb lighting.

However, after upgrading to LED trailer lights, many owners experience:

  • Dashboard bulb warning messages
  • Brake light faults
  • Fast flashing indicators (hyper-flash)
  • Flickering trailer lights
  • Trailer lighting not operating correctly

In most cases, the problem is not the LED trailer lights themselves — it is the vehicle’s towbar wiring system.

Why Modern Towbars Can Struggle with LED Trailer Lights

Traditional trailer lights used filament bulbs which created a relatively high electrical load. Modern LED trailer lights consume significantly less power.

Some towbar wiring systems only output around 40mA, which is often not enough for LED trailer lighting systems. The vehicle may interpret this lower current draw as a failed bulb and trigger warning messages.

This can cause:

  • Brake light warning messages
  • Trailer indicator faults
  • Dashboard bulb failure warnings
  • Incorrect trailer lighting operation

Vehicles That May Require Additional LED Compatibility Support

Some towing vehicles may require additional LED-compatible wiring components, resistor systems or fault eliminators when towing trailers fitted with LED lighting.

This can vary depending on the vehicle’s towbar wiring system, CANbus monitoring setup and the type of LED trailer lights installed.

Vehicles where LED trailer light compatibility issues are sometimes reported include:

  • Land Rover Discovery 3
  • Land Rover Discovery 4
  • Vauxhall Vectra
  • Vauxhall Insignia
  • Some BMW towing vehicles
  • Some Ford Ranger models

Possible symptoms may include:

  • Dashboard bulb warning messages
  • Fast flashing indicators (hyper-flash)
  • Trailer brake light fault warnings
  • Intermittent LED flickering

Some vehicles and trailer combinations may also require compatibility with sequential LED lighting systems depending on the trailer lighting specification.

Some vehicles may also require compatibility with sequential LED lighting systems depending on the trailer specification.

fault eliminator fitting instructions

The Solution: LED-Compatible Wiring or a Fault Eliminator

The best solution is fitting a proper LED-compatible towbar wiring kit or installing a dedicated

LED fault eliminator
.

These systems help create the correct electrical load so the vehicle recognises the trailer lighting properly and prevents false warning messages.

LED Fault Eliminator Fitting Instructions

Correct installation is essential for reliable operation and long-term durability.

Recommended Mounting Locations

  • Trailer A-frame
  • Trailer front board
  • Protected internal mounting position near the trailer wiring connection

Recommended Fixings

  • M8 bolts and fixings
  • Self-drilling tech screws

Important Installation Advice

Zip ties are not recommended.

While cable ties may seem convenient, vibration and road movement can eventually cause them to weaken or fail during towing, especially on rough roads or construction sites.

Secure mechanical fixing is strongly advised to prevent movement, wiring strain and potential electrical failures.

Basic LED Fault Eliminator Installation Process

  1. Disconnect the trailer or caravan electrical connection
  2. Select a secure mounting location on the A-frame or front board
  3. Secure the unit using bolts or suitable tech screws
  4. Connect the unit inline with the trailer lighting wiring system
  5. Reconnect the trailer plug to the towing vehicle
  6. Test all lighting functions including brake, indicator, tail and fog lights
  7. Check the dashboard for warning messages or hyper-flashing indicators

 

Benefits of LED Trailer Lights

Once correctly installed with compatible towbar electrics, LED trailer lights provide major advantages over traditional bulb systems:

  • Longer service life
  • Improved trailer visibility
  • Reduced maintenance
  • Better vibration resistance
  • Lower power consumption
  • Improved reliability in wet conditions

Professional LED Trailer Lighting Solutions

Trailer Solutions supplies professional-grade
Lucidity LED trailer lights,
connector systems and LED-compatible accessories for:

  • Caravans
  • Plant trailers
  • Horse trailers
  • Commercial trailers
  • Recovery trailers
  • Fleet and transport vehicles

Popular products include:

Final Thoughts

If your caravan or trailer is fitted with LED lights and you are experiencing warning messages or lighting faults, the issue is often caused by incompatible towbar electrics rather than the LED lights themselves.

Following proper LED fault eliminator fitting instructions and using secure mounting methods can help restore reliable trailer lighting operation and prevent future electrical faults.

Free UK delivery available on all Lucidity LED trailer lighting products and accessories from Trailer Solutions UK.