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Yes, but... you will need wire heavy enough to carry the current [measured in Amperes or Amps] that the horn uses, and also need to install a control switch in the circuit or the horn will sound continuously. The hookup is simple: one horn wire to the Positive [+] terminal and the other horn wire to the Negative [--] terminal.

It would also be a very good safety practice to install a properly sized fuse in circuit to protect the conductor wires.

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Q: Can you wire up a horn to car battery?
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