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Just to check I am not being an idiot before putting in a service request. I can't get the electrics to work on the tow bar with a trailer. I tried two different light boards. Both cases I selected trailer mode and it just shows a red caravan picture. First time I have tried anything on the tow electrics on the car since I purchased it new.
I just put the same trailer board on my Audi A6 and it works perfectly. So it not the board. Any other settings that need to be switched to get the trailer lights to work in the Tesla model 3?