Chevrolet Luv Electric Circuit 1994

Hello, I'd like to know if anyone has the wiring diagram for a 1994 Chevrolet LUV with a 2.3 gasoline engine. I have a rather strange problem: the horn fuse keeps blowing even when the horn isn't being used, and according to the fuse box, it only powers the horn. When I replace the fuse, the horn works, but then stops working after driving for a while. Any help would be greatly appreciated.