I need to add a gfi outlet to my wifes bathroom. I want to add it to the   
   current light switch box. This box currently has two switches, one for the   
   fan,light and one for the vanity light. Each switch has a white wire, a black   
   wire, and a ground. When    
   checking with a voltmeter, the white wire on both switches always has power.   
   Each black wire only has power when the switch is turned on. I am assuming the   
   white wire is the power wire. Can I take these white wires off the switches,   
   connect them to the    
   top and bottom "hot" terminal on the gfi outlet, then feed the switches from   
   both terminals on the other side of the gfi? When I did this messing around   
   with the switches, everything worked properly. I just thought that the black   
   wire was always the    
   constant power wire.   
      
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