I have (I believe) an old ceiling fan that has a three speed pull chain switch. The chain broke off inside the switch. The switch has four leads, purple, blue, pink (or flesh) and white. My problem is I can't find a switch that matches this configuration. I purchased a three way pull switch that has three leads brown, black and red. I can get the fan to turn on but depending on which wire I use in the fan, I can only get that speed the other two positions are dead.