LDV 400 convoy indicator problems?

I've got a LDV 400 convoy (S reg) and there are problems with the indicators. On the passenger's side where the relays are, I found a round plug with black and purple wires, but half of this is missing and I don't know where the cables are supposed to go. On the driver's side it is in one piece and the cables disapear up under the dashboard. Don't know what they're for. Indicators and Hazard lights don't work