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How to wire a car horn

Updated July 19, 2017

Wiring a horn the right way, whether to replace a non-working horn, or to install a new one to a custom vehicle is a job that a competent do-it-your self type should be able to complete in an hour or two.

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  1. Disconnect the negative terminal from the battery.

  2. Using the self-tapping screw, mount the 20-amp circuit breaker in a protected location near the vehicle battery.

  3. Connect one terminal on the circuit breaker to the positive terminal of the battery, using a piece of wire and two solderless ring terminals.

  4. Connect the other terminal of the circuit breaker to Pin 87 of the Signal Stat 192 relay. Use a length of 14-gauge primary wire with a ring terminal on the circuit breaker end and an insulated solderless spade terminal of the relay end.

  5. Connect Pin 87a and Pin 86 with a short piece of 14-gauge wire, having a female solderless spade connector on each end.

  6. Mount the horn. Use a large self-tapping screw, and mount to an area behind the bumper or grille.

  7. Connect Relay Pin 85 with the terminal on the horn, using a length of 14-gauge wire with solderless female spade connectors on both ends.

  8. Mount the momentary contact switch within easy reach of the driver.

  9. Connect Relay Pin 30 with a terminal on the momentary contact switch. Use 14-gauge primary wire.

  10. Connect the other terminal of the switch to a metal part of the vehicle.

  11. Reconnect the battery's negative terminal.

  12. Tip

    If your replacement horn has two terminals, the other terminal is to be connected to a metal part of the car or the negative terminal of the battery.

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Things You'll Need

  • Signal Stat 192 Relay
  • Horn
  • Momentary contact switch
  • 14-gauge primary wire
  • Automotive circuit breaker
  • Insulated solderless female spade connectors
  • Solderless ring terminals
  • Self tapping screw

About the Author

K.K. Lowell is a freelance writer who has been writing professionally since June 2008, with articles appearing on various websites. A mechanic and truck driver for more than 40 years, Lowell is able to write knowledgeably on many automotive and mechanical subjects. He is currently pursuing a degree in English.

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