1994 nissan altima unkown electric issue?

A while back the 75amp fuse on my nissan blew out. Once replaced the power windows stopped working, the car only locks and when you press unlock there's a click from the powerlock timer but it doesnt unlock. I get a constant power reading from the tail light fuse, rear defrost, and a few others. Theres also a quacking sound coming from the vents when ever I try to change venting area as if the machine is stuck trying to change. I've replaced fuses searched for bad grounds and shorts. I've torn the dashboard and seats out I cant find anything. Anyone out there ever have this issue?