Horn wiring diagram

In order to wire a 15-inch speaker and a horn in a cabinet, you will need to connect the speaker and horn to a power source, such as an amplifier or a power supply. The specific wiring diagram for your setup will depend on the type of speaker and horn you are using, as well as the power source.
To wire the 15-inch speaker, you will need to connect the positive (+) and negative (-) terminals of the speaker to the corresponding terminals of the power source. This is usually done using speaker wire.
To wire the horn, you will need to connect the positive (+) and negative (-) terminals of the horn to the corresponding terminals of the power source. This is usually done using a low gauge wire.
It is recommended that you consult the manual or the wiring diagram of the speaker and horn you are using before starting the installation. It's also recommended to seek professional help if you're not familiar with electrical wiring and safety measures.

The horn button appears to ground the relay according to this diagram.
https://www.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/08/f3/eb/large/0900c1528008f3eb.gif

http://67-72chevytrucks.com/vboard/showthread.php?t=787400

https://www.google.com/search?q=1993+chevy+k2500+steering+horn+wiring

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suggest checking if 12 volts goes to horn wire at horn end when horn pressed from inside vehicle. A 12 Volt probe {google it} can be a cheap checking tool for this.
If 12v volts is switched when button is pressed {could be earth being switched if it is then place probe on constant 12 volts and negative lead on switched earth wire} then the horn itself is faulty.
If no voltage switched then horn relay needs to be checked. check if voltage at horn relay coil contact when button pressed.
if yes then relay may be faulty. if no then horn switch could be faulty.
you can check switched voltage also at horn relay switched contact when relay plugged in. To see if relay is doing what it is meant to do

Use a multi-meter set to dc 12v take the horn out of circuit and connect the positive end to the horn supply from the horn switch and the negative to an earth point on the frame. Press the horn button, do you see the meter jump up to 12v when you do this?

Yes - Replace the horn assembly. It's getting voltage but not sounding.

No - Suspect that the wiring or the horn switch is faulty.

isolate the battery. Disassemble the grip Disconnect the wires to the horn. Set the meter to continuity test. Put the probes on the terminals of the horn switch. press the switch. Do you see the meter on the Multi-meter kick?

Yes - suspect the wiring between the switch and the horn assembly.

No - With the 12V side of the switch isolated from ground reconnect the battery. Switch the multi-meter to DC Volts. Connect the positive probe to the supply side of the switch wire and ground the negative side. Does the meter kick to 12Volts?

Yes - I don't know what is wrong. possibly an intermittent fault.

No - You have no supply form the battery. Suspect the wiring loom from the battery to the switch especially where it goes from the frame to the handlebars. You could have a break there.

Where are you connecting the tester to? If you are connecting one lead to the negative terminal on the battery and the other to the horn wire and it lights up try connecting a wire from the horn housing (bare metal) to the negative battery terminal and attach the horn wire to the horn and try it. if that works the ground path from the battery to the horn mounting place is broken somewhere. you may have to run a negative wire to the horn mounting place to make it work properly. Hope this helps.
Bob

The wire to the horn button is a live wire and it is shorted out when you press the button. This activates the relay and blows the horn. relays normally work by power coming to a terminal through the coil and out the other terminal to earth . This connects the coil and so the contacts are pulled together to allow power from the battery though to what ever is the relay for .. So what you need is power to a coil terminal on the relay and the horn wire connected to the other terminal. This will complete the circuit when you press the horn and the relay will close and the horn will blow.. To get this it may be necessary to piggy back off the power wire ( battery terminal on relay ) to a coil terminal .

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

Battery Constant 12v+ Positive Wire (+): Black/Yellow
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness

Starter Positive Wire (+): Blue/Red
Starter Positive Wire Location: Ignition Switch Harness

Ignition Positive Wire (+): Red
Ignition Positive Wire Location: Ignition Switch Harness

Accessory Positive Wire (+): Red/Yellow
Accessory Positive Wire Location: Ignition Switch Harness

Parking Light Positive Wire (+): Red
Parking Light Positive Wire Location: Low In Drivers Kick Panel

Power Door Lock Negative Wire (-): Add Actuator. This vehicle uses a central door locking system. When connecting a keyless entry, you will need to add a door lock actuator and some units will also require (2) extra relays.
Power Door Lock Negative Wire Location: To Drivers Door Only

Power Door Unlock Negative Wire (-): Add Actuator. This vehicle uses a central door locking system. When connecting a keyless entry, you will need to add a door lock actuator and some units will also require (2) extra relays.
Power Door Unlock Negative Wire Location: To Drivers Door Only

Door Trigger Negative Wire (-): Red/White
Door Trigger Negative Wire Location: In Black Plug, Above Hood Release

Domelight Supervision Wire: Use Door Trigger, Requires Relay
Domelight Supervision Wire Location: N/A

Horn Negative Wire (-): Red/Green
Horn Negative Wire Location: At Steering Column Harness

Tachometer Wire Negative Wire (-): Black/Blue
Tachometer Wire Negative Wire Location: At ECM, Under Drivers Side Dash

Brake Light Positive Wire (+): White/Black
Brake Light Positive Wire Location: At Switch Above Brake Pedal

CODE ALARM SYSTEM

Used on:
Impreza 1996-2001
Legacy 1995-1999
Forester 1998-2000

Battery GP-23A

Lock: Left button will lock all doors. Double chirp indicates locked.
Unlock: Right button will unlock driver's door only. Hold unlock button app 6 seconds, it will unlock all doors including rear gate. Single chirp indicated unlock.
If the car chirps or lights flash 4x the alarm was triggered.
Panic. Press both buttons to activate emergency honk and flashing lights.
Valet mode: With optional alarm onlyPress the red alarm button on the left of the steering wheel. The light will quickly double flash. To re-set back to normal mode, press the red alarm light button again

Battery failed and lights flashing?
Parking lights will flash when the vehicle's battery is disconnected and reconnected.
To stop lights from flashing, either:
Press remote transmitter "UNLOCK" button once OR turn the ignition switch to the "ON" position and press programming button for one second (see below).
The vehicle interior (courtesy) light and door open warning light (DOOR AJAR indicator) will then illuminate for 60 seconds when the ignition is turned off, or until the doors are locked with the remote transmitter. Yes, the dashboard instrument panel lights will flash when the parking lights flash.

Programming or Overriding the Alarm when you have lost the remote
Open driver's door.
Turn ignition key to 'On'
Press and *hold programming button* in (see diagram, button under dashboard)
After 15 seconds the the door locks will cycle 3 times. Do not release Programming button.
Press lock (left) button the remotes to be programmed. The door locks will cycle one time. Exit programming mode by releasing Programming button under dashboard and turning key to off.

Code Alarm Programming Button is under dashboard on the kick panel by the driver's left knee, left of the steering column. If you can't find it, it might still be tucked up in the wiring harness higher up in that same general area. The botton is recessed in a plastic ring (see diagram).
This button must be pressed while programming remotes or if the battery was disconnected and the lights are flashing.

You may have a short circuit in your horn button causing the
fuse to blow when you press the button or in the horn itself.

1. Locate the horn under the hood normally in the front of
the engine compartment.
2. Once you locate the horn, disconnect the wire from the
horn.
3. connect a VOM (Volt Ohm meter) to the horn's wire.
plus(+) side to the wire and negative (-) side to ground
or some metal part on the car.
4, set the VOM to dc voltage and have someone press the
horn button. You should read 12 volts on the VOM, if
not you have a short in the horn button, if you do mread 12 volts
you have a short in the horn. Replace the horn....

Battery Constant 12v+ Positive Wire (+): Black/Orange And Red/White
Battery Constant 12v+ Positive Wire Location: Ignition Switch Harness
Starter Positive Wire (+): Yellow
Starter Positive Wire Location: Ignition Switch Harness
Ignition Positive Wire (+): Blue (16 Gauge)
Ignition Positive Wire Location: Ignition Switch Harness
Second Ignition Positive Wire (+): Yellow/Red
Second Ignition Positive Wire Location: Ignition Switch Harness
Accessory Positive Wire (+): Blue (10 Gauge)
Accessory Positive Wire Location: Ignition Switch Harness
Second Accessory Positive Wire (+): Orange
Second Accessory Positive Wire Location: Ignition Switch Harness
Parking Light Positive Wire (+): Black/Yellow
Parking Light Positive Wire Location: At Headlight Switch
Power Door Lock Positive Wire (+): Orange/Violet
Power Door Lock Positive Wire Location: In Drivers Kick Panel, White 6-Pin
Power Door Unlock Positive Wire (+): Pink/Violet
Power Door Unlock Positive Wire Location: In Drivers Kick Panel, White 12-Pin
Door Trigger Negative Wire (-): Yellow
Door Trigger Negative Wire Location: At Headlight Switch
Domelight Supervision Wire: Use Door Trigger (Requires Relay)
Domelight Supervision Wire Location: N/A
Horn Negative Wire (-): Black/Red
Horn Negative Wire Location: At Steering Column Harness
Tachometer Wire Negative Wire (-): Gray
Tachometer Wire Negative Wire Location: At PCM, Connector 1, Pin A7. The PCM (powertrain control module) is located on the firewall next to the wiper motor.
Brake Light Positive Wire (+): White/Tan
Brake Light Positive Wire Location: At Switch Above Brake Pedal
Factory Alarm Disarm Wire (-): Black/Orange (To disarm requires a (-) negative through a 1565 ohm resistor and an extra relay to connect.)
Factory Alarm Disarm Wire Location: In Drivers Kick Panel, White 12 Pin Plug
Factory Anti-Theft System: N/A
Factory Anti-Theft System Location: N/A