The trailer indicator lamp is only fed from the flasher unit, or should be! Do you have a tow bar and a 4 pin flasher unit?

If not then there is defo a false feed coming from somewhere. Do you mean relays in dash or engine bay??

Will have a 'feel' of my relays. Ooh er......

Ps. Happy Birthday KV's Dad 🥳
I have a towbar with normal trailer wiring plus the caravan plug, and the extra pin flasher unit which does the dash light.

oh, and Dad will be pleased to have an LZ birthday greeting. Thanks Andy.
 

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