I recently changed the oil pressure sensor and must have broken a wire in the harness because the gauges were all dead and wait to start light was flashing when i got done. The local diesel mechanic decided it was a broken ground wire in the harness and instead of tearing the harness apart, just added a ground wire to the tps sensor plug. Its a manual truck so it doesnt have a tps. Everything was back to normal and worked great. A few days later the ac quit cooling completely, like i flipped a switch. I saw that it had a blown fuse so i replaced and swapped relays and it popped as soon as I turned the ac on. I unplugged the compressor from the harness, put in another fuse and it popped as soon as i turned on the ac again. The reason I took it to a mechanic is because im horrible with wiring and the wiring diagrams look like and alien language to me. Anyone got any help for a dummy?