Free wiring diagram

Horn not working ? Is the air bag light lit on the instrument cluster ? May not be a fuse issue , could be the clock spring inside the steering column , or could be the horn relay . If you don't know what these are your best bet mite be to take it to a qualified repair shop. Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohmmeter to test automotive electrical circuit's ? https://www.youtube.com/watch?v=Mru8BbTGDwM&t=327s
Free wiring diagrams here http://www.bbbind.com/free-tsb/ Under system click on interior & driver amenity , then under subsystem click on horn . Click the search button then the blue link . The horn fuse & horn relay are located in the fuse / relay box in the engine compartment . Having a bad (BLOWN) fuse would indicate a electrical short circuit .

Without testing who knows . Do you know what a automotive electrical diagram is ? How to test electrical circuits using a volt meter . Free wiring diagrams here http://www.bbbind.com/free-tsb/ Enter the vehicle info. Year , make , model etc.... Under system click on interior & driver amenity ,then under subsystem click on horn . Click the search button then the blue link . Looking at the wiring for the horn i see a whole bunch of thing's that could go wrong . Fuse , relay , wiring , the horn it self , the cable reel inside the steering column ,other wise called a clock spring. Does the car have a air bag light lit on the instrument cluster ? Videos on youtube. showing how to test horn circuit .

Horn also uses a relay . What year , make , model vehicle. The odds of the fuse being the falt are high , Fuse's do blow , but not for no reason . Short's to ground cause fuse's to blow . Which means electrical wiring problems or short's in electrical componets . Do you know what a relay is an how it works ?
VEHICLE RELAYS Operation Diagnosis
Do you know what electrical wiring diagrams are ? How to use to pin point areas in a electrical circuit ,to test with a DVOM - digital volt ohmmeter ?
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts

Free wiring diagrams here http://www.bbbind.com/free-tsb look under electrical distribution - power distribution . fuse panel . will show fuse layout .

I looked at info for a Silverado 1500. Use a test light to check for voltage at horn fuse in under hood fuse box. According to this diagram, the horn relay has to be energized. Have a helper hit the horn switch when you check voltage at horn fuse. If hot, have to check wiring circuit to horn. In the diagram, dark green wire is voltage and black wire is ground. You could actually use jumper wires from battery for voltage and ground to horn, for testing.

Remove seat it should be under there ,a flasher unit.

horn check it works as they can go, relay is probably gone for the indicators. its usually a green relay, but if its original it could be any color. they not on the same wiring as each other.

Free wiring diagrams and TSB's for every make and model:
http://www.bbbind.com/technical.html
Click on tech. service bulletins and wiring diagrams. Next page, agree to end user license agreement. Next page, click on wiring diagrams, then enter year, make, model, and engine size.
From the drop-down list of systems, choose "interior and driver amenity", then subsystem under that, will be horn. Click on "search" and it will show you that diagram. You can access every system's wiring diagram for your vehicle.

I had the same problem. Horn not working and indicators not self cancelling.
After removing the steering wheel I found that the central two pronged collet, that engages with the steering wheel and drives the horn contact slipring and indicator cancellation, had worn down its prongs. this had caused the horn wires to stop rotating and they had been snapped by the motion of the steering wheel.
the ideal solution would be to replace the collet and horn wires but I managed to repair both