LED trailer lights not working properly

[Cupra TDI 150]

Hi guys

I'm in the process of sprucing up an old trailer my father-in-law has, first on the agenda was to fix the damaged and non working rear lights. I purchased a pair of LED light fittings and connected them up. I seem to have a few problems.

Firstly the indicators when switched on either using the hazard light switch or the indicator stalk flash twice (close together) before a long pause where they they then flash twice again. The pattern is repeated until switched off.

Secondly the sidelights when switched on flash, at a I guess approximately 60-80 times a minute until switched off.

The brake lights seem to work properly.

I've checked all connections and renewed the 7 pin plug on the trailer. There isn't an issue with the vehicles wiring as the lights on the cycle carrier I own work normally, the only difference is the type of lights fitted to each.

Any help would be much appreciated.

 

[Paul20v]

You will proberly find its because of the leds
They do cause problems with a lot of trailer electrics
The car is looking for the correct loads caused by a normal bulb but when leds are fitted and can cause lots of strange thing too happen
Have you plugged in a standard trailer board too test the car ?

 

[Cupra TDI 150]

I have tried my tow bar mounted cycle carrier, all lights work ok just the LEDs on the trailer.

 

[adsfisher]

Do you have a bypass relay fitted to the electrics for the towbar inside the car?

Sounds/looks like it it might be the canbus sending a pulse down the cables checking the lights are not broken. Normal bulbs cant pick this up but the more sensitive LED's do.

If it really annoys you i would say get a bypass relay fitted. They are only 15 on flea bay and wild easy to fit.

 

[Cupra TDI 150]

Not sure if I have a bypass relay fitted or not, I get a second turn signal light on the dash when the electrics are plugged in to my normal bulbed bike carrier. I have ended up getting round the problem by buying another set of normal trailer lights, just would have been nice to have the LEDs working.

Thank you for your reply