93 K1500 A/C Problem

My alternator was bad so bought and installed a new one, easy job. When I started truck alternator gauge showed charging. However, the entire air conditioning controls on dash does not light or work. In other words, no speed control, no illumination of controls, nothing. The A/C compressor seems to be on because I can hear it cycling on and off every so often and I can hear the fan running on very low and a slight amount of cold air comes out of the vents. I pulled the 25 amp fuse for the a/c system and this makes all of the above stop but when I put the fuse back in still have the same problem of no control. Any ideas?