On a 2001 Chevrolet 2500 HD, the horn is typically wired through a relay that connects to the horn switch on the steering wheel. When the horn button is pressed, it completes the circuit, sending power to the relay, which then activates the horn itself. The horn is usually grounded directly to the vehicle's chassis. For troubleshooting, you can check the fuse and relay associated with the horn circuit if it is not functioning properly.
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