It could be that you have the compressor hooked directly to the battery, without any sort of power switch (such as the horn button on the steering wheel.) Is the air horn after-market? Does your truck have it's factory horn? If so, you may be able to disconnect the original horn (or locate the wires if already disconnected) and run these wires to your air horn's compressor, using the steering wheel horn to operate.
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Most of the "Train Horns" are air operated. You'll need a 12VDC compressor, wiring, pressure switch to turn it on when pressure falls, a storage tank of a few gallons to hold the air until you're ready to sound them and a 12VDC solenoid connected to the wire that fed the original factory horn that will let air blow into the horn when you press the horn button. You've got a ways to go yet.
Im having the same issue with my 6127, I wired it all accordly to the instructions and the horn is constant. Using the relay supplied, connectin pin 1 to 3 and 3 to constant 12v. Connect 2 to horn wire and 4 to + on the compressor. Negative on compressor to ground, and horn goes off? Not sure what to do
Ok first thing is it sounds like a wiring problem. So first step is to make sure the thermostat is properly connected. Which... the main thing here is there needs to be 24v dc power coming from your control board (transformer) going to the thermostat..generally that is the red wire. All the thermostat does is connect that "red" wire (power) to one of the other wires to complete a circuit. So make sure you have 24 volts... (generally about .5amps) . if you have power than switch thermostat to fan only should energize the green wire only. then switch to ac and move temp low enough that the ac should turn on and that should energize the yellow wire. for sure one of those wires is incorrect now or the fan wouldn't be on OR THE THERMOSTAT IS NOT CONNECTING THEM AND IT IS BAD. Now about the compressor and fan.... those same wires run out to the compressor unit... ok the yellow for ac.. greeen does not go to compressor unit that is for fan only (vent).. red carries the same 24 volts... one difference here is that most carrier units only have the one transformer....so you run the red wire is the +pos 24 volt..and then a "common " wire is needed which is the Ground or neg... that wire on a carrier is brown usually but could be different depending installer. The orange wire goes to the pump reversing valve it is always energized when on ac mode...when heater is on in the winter it is heat pump and is not energized so just connect the orange and yellow together... tell me more specifics if this doesn't help and i'm sure I can help you... thanks Chuck
using the wiring schematic provided with horn atthatch both power feed on relay # 30 & # 86 to fused circuit in fuse box ( or in line fuse to batt positive ) & --- # 87 to the horn compressor,then # 85 to a button inside the vehicle............ some off those chines relays work backward or are defective.........
If the compressor has 3 air connections on top then the two lower terminals with nuts are the + and - supply inputs to the compressor motor. The two top spade terminals power a solenoid valve which changes a triple sequence (illegal?) to a combined blended triple tone. I don't think polarity is an issue but to check this connect a 12V battery -ve to the mounting bracket on the compressor. Attach 2 wires to a headlamp bulb and connect one to battery +ve. Then touch the spare wire to each of the 4 terminals in turn. If the bulb lights that terminal is at compressor ground. You can determine the operation of the relay in the same way. Between 2 terminals the relay will operate. Note those and then test each to the relay bracket to see if one side of the coil is grounded. By powering the relay directly from the battery you can then use the bulb to determine which contacts are 'made' when the relay operates. You will need a relay to control power to the motor. The solenoid valve probably only takes a couple of amps. You could run both the motor and the solenoid valve from the same relay if you just wanted a blended composite tone.
most new cars have what is called a clock spring be hind the steering wheel.this is a flat ribbon cable like what you would Se in a computer.what can happen when the ribbon is damaged is the horn can quit working.the cruse control .and the air bag light will come also.but most likely one of the problems will occur.but over time the other problems start happening also.so are you sure you are getting power to the relay .use a volt meter on the terminals under the relay and have someone to push the horn button.this will tell you if you are getting power from the horn button.
Sounds like the compressor isnt getting power nor told to do so.
My first step to try for power is to go to the engine bay, Go to the fuse box above the engine and swap the Horn relay for the one in air suspension and try using the horn. If the horn doesnt work theres your problem!
Next step if above fails. Is to check for any blown fuses and replace as needed then retry.
The air suspension also has a height sensor on it, If that has failed the car wouldnt work out where it was and wouldnt adjust. also there is a Air Suspension/Evo Steering Module which controls the system but if there was a problem with this i belive you would also loose power steering.