Horn stopped working yesterday so was booked in by boss to be fixed tomorrow but tonight what driving it came on and was stuck on. Couldnt get it to go off eventually pulled 1 of the relays out and it stopped. Put relay back in and it came back on so pulled relay out again. Horn will blast if I start the lorry with lights off but if I start with lights on horn doesnt come on. It now works if I press it on steering wheel. Sidelights and trailer lights are not working now however and also onboard weigher.
Any ideas?
