1994 Nissan D21 Electrical issue

1994 Nissan Pickup D21I have a 1994 Nissan D21 which I have had problems with the horn blowing fuses before. I just recently replaced the horn and everything was working fine for a couple of weeks. A week ago, I was sitting my truck and noticed the Air Conditioning had stopped working, I tried turning the a/c off then on but it still did not work. I turned my truck off and then back on and it came back on. A few minutes later, I drove off and turned the radio up and it stopped playing music but still had power to the radio. The next day, I was backing up, blew my horn and the fuse had blown. When I pulled out on the highway, I realized my turn signals would not work. I tried my flashers and they are working. Any idea of where I need to start looking? I brought it to a mechanic and he sat on it for a week then went on vacation.

Looks like you may need to do some tracing in the wiring. Use the wiring diagram provided to assist in tracing the wiring harness.

Turn Signal Wiring Diagram 1994 Nissan D21 Pickup