3 black wires, one white in light box
3 black wires are twisted together and connected to the blue and black on the old ceiling fan. The one white is connected to the one white on the fan. Have tried connecting these wires many different ways for a new remote controlled fan but no luck . This is a very old house with old wiring (I have seen no signs of knob and tube) and all the wires have a fabric covering. I have installed three new ceiling fans in other rooms with no problems. All of the others had only 3 wires in the light box so with trial and error I could figure out which wire was hot and which ground or neutral. This box seems to complete other circuits because now that the wires are disconnected other lights and outlets in rooms on the same floor don't work.