On the circular thing that bolts to the bit where the cabin filter lives behind the dash, a previous owner of the car has at some point chopped the proper plug off and left me with 2 blade connectors instead. I cant work out where this needs to be connected to on the new loom to make my heater blowers graft. It only has 2 wires, a thick red and a thick brown but I can see a matching plug anywhere . Any ideas where they need to go?