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.

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.

Items you will 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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