Your horn button and wiring is ground for the coil side of horn relay, usually. My guess is problem with horn wiring in steering column, maybe a clock-spring issue? I saw two different years listed for your vehicle? It may not make any difference?
SOURCE: 1998 S10 Chevy Horn not working
You most likely need a new clock spring rotating contact under the steering wheel, it is a plastic ribbon with wire in it to connect the horn button and other accessories to the steering wheel while allowing the wheel to turn.
SOURCE: Chevy pickup 4-wheel drive won't engage
Replace the push button selector assembly. Common failures. If that isnt the problem then the encoder motor on transfer case has failed. Try switch first.
SOURCE: transmission on my 2000 chevy k2500 4x4 pickup
your transmission has possibly been rebuilt with stronger springs put in. No worries. have been running mine for along while without any problems. Better this than slipping, but it is a bit annoying.
SOURCE: My horn quit working but the relay and fuse are
It sounds like the switch itself, on the steering wheel, are not making contact. I'm guessing that if you can remove the front part of the steering wheel you could check and clean the contacts and also give you a chance to test the horn, while you are in there.
SOURCE: 90 chevy k2500 5.7 intermittent backfire into
It may be a sticky lifter if intermitent
did you check all cdes?
the map sensor can do this as well
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Usually answered in minutes!
Just fixed my 95 chevy 2500 horn today... Was stuck on (middle of the night, of course) so I just pulled the fuse.. NONE of the info I found while researching this problem was correct or relevant. There was NO airbag. You just pull off the cover in the middle of the steering wheel - it just snaps on at the 4 corners. Remove the black wire from the steering wheel side and the red wire from the cover side. Then separate the rubber outer cover from the plastic insert and you'll see the metal contacts for the horn - it's a big die-cut piece of thin metal. You just have to bend it around the edges with a screwdriver until it springs up when touched at any point. Then just reassemble and connect the wires. Total time: 5-10 min.
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