Question about JC Whitney Electric 12 15 Psi Air Compressors for Air Horns

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How to wire up air horns independon to car horn

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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.........

Posted on Jun 06, 2011

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Posted on Jan 02, 2017

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1 Answer

I purchased a 2 trumpet train horn for my car is it a two wire horn or one and what else do i need to install it


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.

Dec 02, 2015 | Cars & Trucks

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Removed the only wire connected to horn it now is only held and connected to frame by a single bolt. Afraid to wire in air horn because horn still sounds even though it has no wire connected to it.


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.

Sep 16, 2015 | 2000 Isuzu VehiCROSS

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I have a 1998 chrysler concorde. The airbag light on the dash stays on and my horn doesnt work. How do i fix this without costing me tons of money?


Could be a wiring problem or the clockspring in the steering column.
You would need to pull the steering wheel and test the circuits.

Mar 26, 2015 | Chrysler Cars & Trucks

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How to repair mitsubishi


Not being smart but get a manual or youtube it. You need to remember that the air bag is located near the horn device. You can be hurt by the bag if it inflates.

Apr 16, 2014 | 2003 Mitsubishi Eclipse Spyder

1 Answer

Kleinn air horn 6126/6127/ddi air horn and compressor package problems


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

Aug 17, 2013 | Cars & Trucks

1 Answer

Horn blows by itself


I verify its not a stuck relay...

I disconnect connector under dash and horn stops...


I then suspect its the Horn contacts or a worn grounded wire in air bag/horn switch assembly in steering wheel.




The decorative Vinyl cover shrinks with age...presses on horn contacts against air bag.

I Disconnect Air bag connector (identified as Yellow wire and Connector) usually under dash.

WARNING: ( I Do not - I DO NoT probe the yellow harness/connector with a meter or test light. A test light WILL Detonate my air bag, and impale the bracket in a nearby object/person - me.)

I Removed screws (2) behind steering wheel - which allow air bag horn assembly to be removed.


I Disconnect Air bag connector in this location as well (identified as Yellow wire and Connector) and then;




The red (color varies) and black Horn wires will be plugged into ribbon connectors usually (2) two that feed/connect to contacts for horn function on face of air bag.

I pause here and verify horn will stop blowing when I disconnect the wires going to horn contacts. So I get horn blowing again...

Check horn: To verify this is the cause; I reconnect (whatever fuse/relay/ connector (Not the airbag connector) I disconnected so they will stop blowing) and get horn/s so they are blowing again...

Then I disconnect the ribbon connectors to verify blowing stops.

Note: The experience I had with horn on

Buick Park Ave was at night when temperature cools after hot day, the vinyl cover shrank and horn blows... pressing on horn area of steering wheel firmly would stop horn briefly - then continue.

Note: I will need a rivet tool and rivets... to reassemble.

WARNING: I Do not drill into airbag explosive container. If I do not know how to carefully drill off correct rivet heads and remove vinyl decorative cover from air bag/horn... I STOP and go to the junkyard or ebay and purchase/replace the airbag/horn assembly.

I continued by drilling out rivets (the rivets holding vinyl cover) by using a drill bit as large (or smaller) as the head of rivet and drill gently to release head from rivet body/shank.



I mark all pieces with a magic marker to verify I reassemble right side up (all metal brackets and trim plates and cover).



I Remove vinyl cover exposing horn contact pads which were sandwiched between cover and air bag container.

I used a razor blade to remove vinyl honeycomb material from area of vinyl cover - that when pressed - would activate horn/contacts.

Only a 1/16 of an inch or less needs to be removed.

(I Bend cover inside out and shave material off of area slowly. Care not to cut myself.)

I Reassemble in reverse order with rivets.

Check horn: ...function at this point... by plugging in horn connectors and assure horn contacts work properly as expected.





Feb 21, 2013 | 1997 Oldsmobile 88

2 Answers

How do I fit air horns to my car


They usually come with detailed wiring instructions inside the packaging, from the store. Not at all too hard to install.

Jan 19, 2011 | 1998 Chevrolet Astro

2 Answers

Hi i want to replace standed horns with air horns do i need to replace the wireing or do the standed horns have relay.


You can use the standard horn wires to the relay , but you will have to add the relay that comes with the horns. So more power goes to the air horns. Be careful to mount them so they do not fill with bugs while you drive , or when you need them they will not work.

Oct 20, 2010 | 1998 Yamaha Royal Star XVZ 1300 A

1 Answer

Compressor wont stop running


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.

Mar 01, 2009 | JC Whitney Electric 12 15 Psi Air...

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