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Discussion Starter #1

I'm installing an air horn to replace the cheap excuse of a horn
that you can't even hear. Looking at the diagram (the red circle) shows
an existing relay for the horn.
Will this suffice for the air horn or should I install a separate
relay? I am thinking that installing another relay is redundant and
unnecessary. But this is based on what is shown in the service manual.
I could be wrong so wanted to check with others first.
 

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Dont know about the your question, but i wanted to ring in and say make sure you take plenty of pictures and do a good write up, because this is one mod that i will be doing as soon as i save a little cash.

What horns are you planning on running and how many?
 

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^ X 2 to what sexterra said...I've gotten to the point that I'm so embarrassed by the wussy horn that I don't honk anymore (and believe me, around here, people drive like complete morons) and I've been wanting a loud horn for a long time. I'm sorry I can't help with the wiring question, but good luck! And please do document it!
 

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That relay should work. Not sure what horns you are installing but if it is the electrically driven air horn ones, that will do. The pump will get it's power from the Bat. and this relay is just the trip. You can use it with the factory horn of alone by unplugging factory horn. MC
 

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Discussion Starter #5
Thanks I figured that relay should do..
If not, I guess I'll find out soon enough.
Never had a service manual for any of my
other cars. Comes in handy every now and then.

Waiting for rain and wind to die down..
That storm Ernesto has just about passed
down here in FL.
 

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that relay will work.
Are you installing an air horn that requires a tank and compressor, or just the kind you can buy at the autoparts stores that come with the little compressor that just puts out air when you need the horn?

The smaller kind that does not require an on-board air system will work fine with the stock relay, infact I currently have that in my truck, and it works, but I think that horn is worse than the stock one...its louder, but the tone is more girly.

If you are running a horn that requires an on-board air system, you really dont even need a relay, but if you hook it up to the stock relay it will work just fine. I just installed a system like this over the weekend using a 5gal air tank and a small compressor from PepBoys. It works great using the stock relay. I have yet to mount the horns, but once I get that done I will post pics.
 

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I have the wolo challenger EV air horns in my truck. I just put a wire into that spot under the stock relay. It does run to another relay. I put the airhorns onto the radiator bracket behind the grill. They are mounted horizontally. The airtank is where my winch will go when I get one. The compressor is next to the airbox. Compressor is hooked up to an accessory + (that way it only runs with the key in the on position.)
They are about 125db and sound like an 18 wheeler is behind you. :bounce:
You can just see the chrome caps.

Compressor mounted in the winch spot on the shrock:


the compressor next to the air box:

the wire going into stock relay: Stock horn is still operational

This is what the horns look: http://www.jcwhitney.com/autoparts/Search?catalogId=10614&storeId=10101&sku=challenger+ev&searchbtn.x=25&searchbtn.y=16
 

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Discussion Starter #8
well.. I had the horns in for about 2-3 weeks. I had originally wired the
compressor directly to the horn wire assuming that the stock relay
would be sufficient. The compressor worked fine when using the horn
for short bursts. But any long bursts (few seconds) and the fuse blows.
So after replacing the fuse 3 times, I finally installed a relay.
Works better now. The horn volume after the relay is considerably louder
than before without. I am assuming it now gets all the power it needs.

I was considering install pics, but it was so simple to put in, I figured it
wouldn't be of any use for anyone.
 

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Now you see why I posted to use a second relay. Also be cautious about your alarm, I had to install a larger amperage relay to keep from frying the brain, I have replaced the original brain due to the air horns frying it out when the alarm went off...
 
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