If you take the steering wheel off you'll see the ground wire that grounds the constantly connected horn. Note the color of the insulation.
You could also reroute the wire from under the hood starting at the horns and simply connecting a switch that grounds the horn out to operate it with an outside switch, that is outside of the steering wheel.
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Yes, just find the horn and follow the lead from there. It should always be energized with positive voltage or current and if you got a test light to complete the circuit to ground, it should honk.
It is possible that the horn's ground wire that leads to the steering wheel is shorted to ground. I would inspect the wire as far as you can go to see if maybe the insulation wore off of it, maybe even near the firewall.
Good luck to yo on this repair.
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Is there any way to locate that ground wire or the voltage wire without having to remove the steering wheel but from underneath?
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