Can't find the horn or the horn wire?... if it's the wire you need to power, it's the black wire at the steering column, I would need make and model of the alarm you have to tell you which wire to connect to activate the horn when the alarm goes of or is armed or disarmed.
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You could have a couple of problems. The antitheft system could be making the horn sound. Especially if the horn is not steady, but an off/on cycle.
Years ago, and we are talking about a 1967 model, GM put the horn relay inside the starter relay. If they still do that on some models today, I can not say, but you may try to trace the wires from the horns back to the power source.
You can unplug the horns, but it is dangerous and illegal in some states to drive that way.
Anyway, right now you do not know if the antitheft is making this happen or if the Horn relay is stuck .Check with an autoparts store for your horn relay and see what it looks like. You may want to change it.
If the horn works with the alarm button but not with the steering wheel horn pad the problem is most likely in the contacts beneath the steering wheel. This requires pulling the steering wheel and repairing the contacts. If this vehicle has an air bag in the steering wheel make sure to deactivate the airbag circuit before pulling the steering wheel.