Hello, I have a 1973 Range Rover Classic. All of my indicators light up but don’t flash. I’ve got the dash out but can only find one flasher unit, which is for the hazards. This clicks but doesn’t operate the lights, I’ve changed it for a new one, no difference. I can’t find the other flasher unit for the indicators, but as I said they do light up suggesting an operative circuit. I’ve found a four pin three wire unit under the dash that I don’t know what it does, see pictures, can anyone help my issues. I have been restoring the car but have never had it on the road, I hope to run it this summer with your help, thanks