1994 Ford Taurus loss of pow electrical problem changed wip

My wife bought a 1994 taurus SHO the wipers didn't work she was told that it is the wiper motor she buys a motor after I told her it's the multi function switch on the colum I install it at her wishes start the car and now the car has electrical problems and still no wipers the volt gauge is all over the place and it will not stay running heater display shows crazy read out go's on and off every part of the electric system crazy idle speed up and down! I think it now needs a alternator. If problem still remains after I change that where should I go? And I am now changing the wiper switch!