Is this a wiring problem with my '92 Chevrolet Cavalier? Or just random small problems?

My 1992 Chevrolet Cavalier has been having random intermittent problems .. I stopped using it when we got a new car, but I'm going back to college and had to put it back on the road. When I had stopped using it, the horn had stopped working - it would occasionally beep if you pushed it, but most of the time it would just click. The fuse is fine, so I figured it was either a faulty horn or bad wiring. Now, the brake light won't turn off unless I pull the fuse. It's not stuck at the pedal; the pedal travels correctly and it pushes the on in as it should. Could there be any correlation between the two problems, like a wiring harness problem, or is it likely that there are two separate electrical-oriented problems? I could try to replace the sensor at the brake pedal and try and fix the horn, but I don't want to spend the time and money if it's going to be a widespread electrical problem.. Any input is appreciated!