OK here goes,
The two browns that come out of the relay box both join to the black that comes from the harness plug.
The brown from the harness plug joins on to the red at the motor
The Grey from the relay box joins on to the wire going to the resistor
The Red from the relay box joins on to the remaining black wire to the motor.
The purple wire from the relay is cut off and no longer used.
open the relay box cut the thin black wire where it joins the thick black one and join the thin black wire on the pcb to the thick brown one on the relay, just above the grey.