I want to install a ceiling fan in the living room. It had a fan before we bought the house but the fan was gone. Now there is black, red, white and green wires coming down . Green is ground, white neutral. The black shows full voltage but the red half voltage based on a switch being on . What is the red stranded wire? The house is 1976.
The red is probably controlled by the switch on the wall for the light. The unswitched black would have been used for the fan. Fans are often installed so that the fan can be controlled by the pull chains and the light by a switch on the wall.