How to wire a car horn

Written by k.k. lowell
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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.

Skill level:
Moderately Easy

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Things you 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

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  1. 1

    Disconnect the negative terminal from the battery.

  2. 2

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

  3. 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. 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. 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. 6

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

  7. 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. 8

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

  9. 9

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

  10. 10

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

  11. 11

    Reconnect the battery's negative terminal.

Tips and warnings

  • 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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