I have fitted and wired a towbar to my 56 focus. It was working fine but now the right indicator on the trailer does not work and the audible sensor doesnt work either. It works fine on the left though. Also, if I put the lights on, the left indicator beeps and flashes more quickly.
I was advised by the supplier of the towbar that I would not need a relay and so did not fit one. Are these problems caused by not having the relay, and if so what type of relay should I get and where from?
Any help gratefully received!