The chain acitvating the fan broke off in the speed switch (inside the housing below the fan.) Wires coming out of a black box are Brown and Purple. Two additional wires Grey and Black come out of the multiple wire groupings inside the fan housing. The switch has 4 slots labeled 1,2,3 and "L". I need to know which wire goes into which slot. Harbor Breeze Customer Service were of no help. DESPERATE HOME OWNER