Hi, I'm new here and hoping someone can help with a trailer light issue.

I have 2013 Tig and friend recently commented that I had a light show happening on my LED boat trailer light board when I braked. The lights and blinkers work perfectly other than the brake light flashing issue. I read that there is an issue with using LED trailer lights so I have swapped them for incandescent lights, but find that I still have the same issue. I connected up my old box trailer that also has incandescent lights and find that it also behaves the same as the boat trailer light board. There are no error or warning lights happening on the dash or MFD.

I had an after market Hayman Reece towbar fitted prior to taking delivery of the car when it was new.

Is this a known issue or perhaps a grounding problem with the connection on the towbar? Any help would be greatly appreciated!