City horn wiring

Hello,

If you've recently replaced your indicator switch and light switch with a second-hand one and now your horn is sounding continuously when you connect the battery, there could be a few potential reasons for this issue:

1. Wiring Issue: Double-check the wiring connections for the indicator switch and light switch. Ensure that all wires are correctly connected to their respective terminals. A loose or incorrect connection could be causing a short circuit, which might trigger the horn.
2. Faulty Switch: The second-hand switch you obtained might be faulty or damaged. It's possible that there's an internal issue within the switch itself, causing it to send a constant signal to the horn.
3. Short Circuit: It's possible that during the installation process, a wire got pinched or damaged, creating a short circuit. This could lead to continuous power being supplied to the horn circuit.
4. Grounding Issue: Check the grounding of the switches and the horn. Poor grounding can lead to erratic behavior in electrical systems.
5. Compatibility: Ensure that the second-hand switch is compatible with your vehicle's make and model. Different vehicles might have variations in wiring and electrical systems.

Here are a few steps you can take to troubleshoot and address the issue:

1. Disconnect Battery: Disconnect the battery to stop the continuous horn sound and prevent any further electrical issues.
2. Inspect Wiring: Carefully inspect the wiring connections for any signs of damage, loose connections, or incorrect connections. Make sure that each wire is connected to the correct terminal on the switches.
3. Check Switch Functionality: Test the second-hand switch separately before connecting it to your vehicle. Verify that it functions correctly and doesn't cause any issues when operated.
4. Test Horn Circuit: Test the horn circuit by disconnecting the wires from the horn itself. If the horn stops sounding, then the issue is likely related to the wiring or the switch. If the horn continues to sound, the problem might be in the horn relay or elsewhere in the electrical system.
5. Professional Help: If you're unable to identify and resolve the issue, consider seeking assistance from a professional mechanic or an automotive electrician. They have the expertise to diagnose and fix electrical problems effectively.

It's important to address electrical issues promptly to avoid potential damage to your vehicle's electrical system and ensure safe operation.

I looked at info for a Silverado 1500. Use a test light to check for voltage at horn fuse in under hood fuse box. According to this diagram, the horn relay has to be energized. Have a helper hit the horn switch when you check voltage at horn fuse. If hot, have to check wiring circuit to horn. In the diagram, dark green wire is voltage and black wire is ground. You could actually use jumper wires from battery for voltage and ground to horn, for testing.

Aerosol Can Horn, would be the easiest way.
Without wiring, the Horn Button on Steering Wheel could not be used, sorry.
There are remote sensors made for just about everything, but might not find one for a Wireless Horn. That would be cool though.

Electric Air Horns.
Battery Powered.
Eazy to install. Mounts anywhere on car.
Has only 3 wires
Connect one wire to positive battery red terminal.
second wire to negative battery black terminal
Third wire has a switch attached, run that in to the inside of car
CAUTION ....It may be loud

You could pull the horn fuse, that should kill it. The horn fuse is hot all the time. Two possibilities, one is security system, the other is problem with horn switch or wiring in the steering column.
The horn switch is ground for the control side of horn relay. Part of key fob security horn beep, is also a ground wire. In the diagram, you can see the two wires, The one for fob, take it loose, see if that stops the horn sounding by accident. Don't leave any live wires hanging loose, use electrical tape or something to insulate. I don't know if taking that one wire loose will cause any problems or not, I guess you can try it and see?
Of course, you still want the horn switch to work normally.

Hi Christian:
Many vehicles have 2 horns so that the sound is more pleasant. If there is no wire connected to a horn, it can not (in my experience) make any sound. May I suggest that you have someone assist you by tapping the horn button while you locate the horn that is sounding.

I am not an expert on auto horns, but can solve most electrical problems. Do you have a multimeter? Using the ohm-meter, measure the ohm value between the two wires, and from each wire to the horn mounting bracket (you need contact with un-painted metal. The value between the wires should be low (10-100 ohms) but not zero. This represents the horn coil. The value between each wire and the bracket should be very high (10 kilohms or more). This means the horn coil is not grounded to the bracket.

Now, using the voltmeter, measure the voltage between each wire (from one wire to another). The value should be zero before pressing the horn button, and 12 vdc when the horn button is pressed. I would expect one of the wires will also be zero ohms (ohmmeter) when measured to the car frame or body.

Ok, you are ready to hook up the horn. The auto ground wire(s) are connected to a horn wire that is common with the horn bracket. Or, connected to a black horn wire if both horn wires are isolated from the bracket. Connect the auto switch wire (the one that reads 12 vdc when the horn button is pressed) to the remaining horn wire.

One lead is power when button is pushed the other ground.

Check your fuses. Sounds like something in the horn circuit after the switch is shorted.

Did you try disconnecting wires at horn?

Probably the switch in the steering wheel, or fuse, but usually horn fuse works other things too such as cig lighter or radio. If everything else is working fine, then to troubleshoot you'll need a testlight. I would start with the wiring harness where the steering collumn plugs in and decipher which wire is the horn wire. Put the test light clip on +power, then check the wires on the collumn side one by one, pushing the horn button on each one. The horn switch is the wire that makes the light blink when you push the button. If you try all the wires and none make the light blink, then its probably a problem with the horn switch in the s. wheel. Does it have an after market steering wheel? Because aftermarket wheels often have crappy horn switches in them. Also could be a horn relay if it has one. If you listen carfully while pushing the horn, you should hear the relay faint clicking. If you hear this, then the switch is working, but the relay might not be. Follow the sound to find it if you hear it. Test all sides of the relay with your light. Should get power constant on one term, and the other two should light when the horn button is pushed. Hope this helps. Cheers.