INDICATORS NOT WORKING ON LORRY!!?

MY IVECO LORRY WHICH IS A HORSEBOX HAS A PROBLEM WITH THE INDICATORS BASICALLY THEY ARE NOT WORKING BUT MAKING A CONTINUOUS NOISE INSTEAD OF A BEEP BEEP!! HUBBY HAS CHECKED ALL BULBS BUT THE HAZARDS DONT WORK EITHER WE DONT REALLY KNOW WHERE TO START LOOKING, I HAVE BEEN TOLD THAT IF THE HAZARD SWITCH FAILS THAT IT WILL MUCK UP THE INDICATORS!! HEY BUT IM JUST A GIRL DRIVING A LORRY!! ANY ADVICE GRATEFULLY RECEIVED