How to Wire a Car Horn

by K.K. Lowell

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.

Step 1

Disconnect the negative terminal from the battery.

Step 2

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

Step 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.

Step 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.

Step 5

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

Step 6

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

Step 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.

Step 8

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

Step 9

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

Step 10

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

Reconnect the battery's negative terminal.

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