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Old 02-26-2012, 03:55 PM   #1
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2door JK horn replacement - with PIAA 400+500Hz horns - with PICS!

My turn to contribute:
I replaced the stock horn on a '12 2-door JK with dual PIAA horns, 400+500Hz, and thought I'd show what I did to allow others to maybe improve their own modding...maybe save someone some time...
tools/items needed:
pliers
socket wrench with multi-position head
10mm socket
1/4in. socket
size T20 six-pt./star driver(used with 1/4in. socket)
MAGNETIC retrieval tool - you WILL drop something in this tight space
spacer of 10-12mm thickness
horn(s) + wiring

So I removed the hood sensor holder with the 10mm socket to gain access to the horn location


what the sensor looked like(sorta)


This is a tight space(that's what he said) and if you are thinking of headlamp replacements. now might be a great time. I should have. I will have to undo all this to get access to the headlamp(driver side)(green connection shown)

this shows the six-pt screw that the OEM horn bracket is held with; this is where I attached both horns, using their brackets, though I had to rotate the horns a bit to allow them to both fit in the space of the OEM horn.


here is one horn in place; wanted to show the wiring = on my jeep the black was the positive and the green wire was the ground


I used a left-over spacer from an LCD tv wall bracket to allow the horns to be held away from the headlamp


This pic just shows the internal diameter being large enough to allow the screw to fit thru passively


in position


horns fitting VERY snugly; I bent the brackets(holding the bracket with some pliers) a bit in order to get them to fit into the space



before the hood sensor is replaced


everything ready to roll


since there are youtube vids showing the audible difference(such as ) I did not do one, but thought these pics may help.
Enjoy!

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Old 02-26-2012, 07:05 PM   #2
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I've been wanting to do this to mine for awhile...the stock horn is anemic, at best.

Unfortunately, I keep pushing it to the bottom of the "to do" list. But when I get around to it, this will help. Thanks for the writeup, doc.

(Also, I've been kinda curious how the PIAA's would fit on a '12.)

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Old 02-26-2012, 07:43 PM   #3
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Dudes keep winking at me when I toot my horn
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Old 02-26-2012, 07:58 PM   #4
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Check the pic - next to driver-side headlight, in the 'shade' next to the radiator, there are two very nice tabs. I have very few options on my 12 JK, so your tabs might be 'busy'. Mine were available. So that's where I put a pair of horns. Removed the stock horn (nothing in the way), and mounted the horn relay in that same spot. Wired it all up, and I have a nice dual-tone horn that's out where it's easily heard.

If you go mudding, this might not be a good idea for you. Rock-Good, Mud-Bad. If rain turns out to be a problem, I'll just mount a pair of Hellas as I know they are waterproof.
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Old 02-26-2012, 08:13 PM   #5
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docholiday, thanks for sharing the pix. Did you have to use another relay or simply split the factory horn wires 2-way?

Thanks.
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Old 02-26-2012, 09:48 PM   #6
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The kit comes with the splitter.
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Old 02-27-2012, 07:10 AM   #7
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Is your JK a 6 speed or 5 speed auto ?
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Old 02-27-2012, 07:23 AM   #8
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Quote:
Originally Posted by FLHTHD1 View Post
Is your JK a 6 speed or 5 speed auto ?
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Old 02-27-2012, 07:30 AM   #9
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Quote:
Originally Posted by sclui56 View Post
docholiday, thanks for sharing the pix. Did you have to use another relay or simply split the factory horn wires 2-way?

Thanks.
No relay required. Basically plug and play.
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Old 02-27-2012, 08:29 AM   #10
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Quote:
Originally Posted by FLHTHD1 View Post
Is your JK a 6 speed or 5 speed auto ?
Quote:
Originally Posted by daggo66 View Post
Daggo66,
I think FLHTHD1 is asking about AZduck's JK. His radiator photo doesn't show an auto tranny cooler. He has tabs where a cooler would mount that he is considering to use for mounting horns.
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Old 02-28-2012, 06:40 AM   #11
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Quote:
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Daggo66,
I think FLHTHD1 is asking about AZduck's JK. His radiator photo doesn't show an auto tranny cooler. He has tabs where a cooler would mount that he is considering to use for mounting horns.
Thanks Daggo66, sorry for the
That was why I was asking ( I have a auto on order and didn't know if I would have room in mine) The stock horn is very poor !
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Old 02-28-2012, 10:49 AM   #12
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This was on my list, but after listening to the video, I didn't hear enough difference to do this mod right away. Maybe it's just my ears, but just a different pitch. Leaning on the stock horn may be more effective....dunno.
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Old 02-28-2012, 02:22 PM   #13
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Quote:
Originally Posted by sclui56 View Post
docholiday, thanks for sharing the pix. Did you have to use another relay or simply split the factory horn wires 2-way?
Thanks.
As mentioned by others no relay required for this kit. I spliced into the OEM wires with the included wires. I may have left out that the OEM horn has tabbed connections, as does the PIAA kit I used. So one horn got the OEM conx and the other got the spliced wires connection.
Also TEST your connections before you bolt on. Last thing you want to do is cram these things in and hear only one or worse NO horn

Quote:
Originally Posted by FLHTHD1 View Post
Is your JK a 6 speed or 5 speed auto ?
I have the 5sp Auto

Quote:
Originally Posted by JKatfish View Post
This was on my list, but after listening to the video, I didn't hear enough difference to do this mod right away. Maybe it's just my ears, but just a different pitch. Leaning on the stock horn may be more effective....dunno.
Sure, its not a LOUD difference but its the difference of sounding like a moped(OEM) v. sounding like a 4-wheeled vehicle(better mod)

I have HAD to use the horns twice since install - glad I had 'em. Used the OEM horn once, weeks ago = pathetic.
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Old 03-02-2012, 04:56 PM   #14
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Well, I was a driving down the road and someone was pulling out in front of me. I blew my horn and they didn't even hear me (raining). I wanted the PIAA but was so pissed off, I went to Advanced Auto and got the Hi/Lo WOLO Maxi Sound 112db horns they carried for $29.95. Just got it on. Huge improvement. Not sure about the Wolo horns but it was a huge improvement. Video is from Cell phone so it really not a great quality sound but here it is anyways

http://youtu.be/B_BNVD8RmQk
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Old 07-24-2012, 09:55 PM   #15
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Did the PIAA 400 & 500 Hz install this afternoon on my '12 JKUR. I have an automatic transmission so the tranny cooler encroached on the space I had to install...I ended up cutting off half the shield on one of the horns to allow it to fit better. I also spliced into the stock hot and ground wires and extended both quite a bit more...having that slack in the wires makes the install so much easier. The spacer idea mentioned by the OP is great. It really helps the install go better. Sound is louder for sure. Not train horn loud, but definitely better than stock, and the two tone is also cool.
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Old 07-24-2012, 10:57 PM   #16
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good write up.. my new horn comes tomorrow, I guess its a little more involved that I originally thought, so I'll probably wait til this weekend or next to install...
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Old 09-17-2012, 05:40 PM   #17
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can anyone confirm is horn swapping eliminates the Delay??

thanks!
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Old 09-17-2012, 06:57 PM   #18
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Old 09-17-2012, 07:02 PM   #19
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can anyone confirm is horn swapping eliminates the Delay??

thanks!
It doesn't. That's a separate issue.
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Old 09-18-2012, 01:24 PM   #20
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It doesn't. That's a separate issue.

crap! thansk!!

any aftermarket work around anyone is aware of?
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Old 12-25-2013, 05:56 PM   #21
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wow I just bought one of these and hope I can figure it out great write-up!
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Old 12-25-2013, 05:59 PM   #22
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wow I just bought one of these and hope I can figure it out great write-up!
The instructions it comes with are pretty easy to follow.
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Old 12-26-2013, 06:41 AM   #23
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Thanks a ton for this thread! I have a pair of Hella Supertones waiting to go in once my new headlights get to me. I am planning to install them both into my Jeep at the same time. This thread has provided valuable insight into the coming tasks.

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