77 Chevy pick up steering horn repair - 1983 Chevrolet K1500

The horn button appears to ground the relay according to this diagram.
https://www.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/08/f3/eb/large/0900c1528008f3eb.gif

http://67-72chevytrucks.com/vboard/showthread.php?t=787400

https://www.google.com/search?q=1993+chevy+k2500+steering+horn+wiring

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Fuse box is located between steering column and emergency brake.

Yes.

The horn relay is NOT in the steering column. It's behind the left side of the instrument panel

I have a 92 chevy camaro Rs. My horn on steering colum don't work. They ran wires from battery and put a horn button next to driver left side of steering wheel in 2015. My question is where is Horn relay located so i can check that and fuse first before letting someone open up steering wheel for connection. I am a Female trying to do this. My husband has no patience for this stuff. And always ends up with xtra parts after... SOS

First of all, there is no wire that runs from the horn to the steering column (if the horn circuits had been properly diagnosed you would know this). I would recommend diagnosing and repairing the horn circuit the correct way rather than butchering your wiring harnesses and adding more problems to the electrical problems that you are already experiencing.

If you would like help with diagnosing and repairing your truck's horn circuit, I would be happy to help you do that.

THE horn piece should turn with the wheel lock plate. if it does not then something is not installed properly

Are you speaking of the horn? Or the horn relay? Or the horn button? Or the horn button split ring armature? To remove the horn assembly in the steering wheel you will need a steering wheel puller and a U shaped clamp that will screw down to the steering bolt you will need a 3/4 socket with a 3-inch extension and a ratchet. You will also need to picks to pull center snap ring off to get to the parts under the plate for the horn. To remove you will need to buy 2 security nuts tork wrenches #8 I believe, you will have to disconnect the battery before working on it as the bag could explode if you do not have the battery disconnected. After removing the positive side of battery cable wait 5 minutes before proceeding. Then remove the two bolts that hold the front horn assembly and air bag from the rear of the steering wheel next remove horn air bag assembly and disconnect the wire for the air bag. Place horn to the side then remove the 3/4 bolt out from the center, next install steering wheel puller on the steering wheel and put in three bolts and tighten them evenly so that the puller is on straight. Screw center bolt into the steering bolt until the wheel comes loose, remove steering wheel and place it at the side, next use the U shaped clamp to press the center plate down 1/4 inch to be able to clear the snap ring around the steering wheel. With one pick hold the ring in place with the other force it between the steering wheel bolt and work the ring up and out of the grove it sits in. Next work it all the way up till you have it in your hand, and do not lose. Now pull plastic plate off if you put the wheels straight then it will go on the same way you pulled it off because it's keyed mark it with a felt tip pen so you don’t have to hassle with keying it in again. Next remove the plate and there you will find the horn contacts and the round disk that the connectors push against, so if you need more info just ask on this post.

It sounds like my old chevy that I had
I took the steering wheel front part off and had to tighten the connection .

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.