Hooking aftermarket horn up to stock YJ horn switch. . .wiring diagrams??? - Jeep Wrangler Forum

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Old 02-26-2009, 08:46 PM   #1
Join Date: Feb 2009
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Hooking aftermarket horn up to stock YJ horn switch. . .wiring diagrams???

The horn wiring circuit is not in the service manuals. . .and I'm trying to hook an aftermarket horn up on my '94 YJ. . .should be really straight forward except for the air compressor for the horn doesn't get enough power using the OEM hook-up (ground and switched 12V+). . .so I have to hook it up to the YJ using the relay that came with the horn. . .but I don't want a second horn switch. . .I want to use the stock horn switch.

I'm supposed to hook the compressor negative to chassis ground (done), hook the compressor positive up to relay post #87 (done), hook relay post #86 to relay post #30 along with running a wire from post #30 to the battery with an inline 20A fuse, and finally hook relay post #85 to the provided horn switch. . .and then ground the horn switch

. . .so if I wanna hook this up to my stock horn switch what do I need to do??? I know that the stock horn uses a 10A fuse located in the power distribution center behind the battery. . .other than that I'm not sure because I don't have a wiring diagram of what is going on. . .

. . .does the stock horn switch have a separate ground like the aftermarket switch or does it use the gound that the OEM horn uses. . .if it uses a separate ground then I'm good there and I can keep it that way. . .which would lead me to believe that I could hook the OEM 12V wire from the horn up to Relay post #85 and either run a wire to the battery with the inline 20A fuse or I just need to replace the stock OEM 10A fuse with a 20A and all should be good. . .right?

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Old 02-26-2009, 10:19 PM   #2
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Heres A Wiring Diagram I Seen Horn On It So I scanned it From Haynes repair manual.If this is not it, I have plenty of others in the manual,just let me know.Hopefully this is it.

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Old 02-27-2009, 12:39 PM   #3
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Yea. . .I have that diagram as well. . .and it shows the to the horn connection on another diagram in the Haynes manual as well, but neither diagram actually show the horn with the horn switch and how the power is run which is what I need. . .I need to know if the positive runs to the power distribution center, through the 10A fuse and then to horn and if the switch has the negative or positive side switched so that I can properly hook the relay up. . .

Thanks for posting though.
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Old 11-06-2012, 09:09 PM   #4
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were you able to get a better wiring diagram for the horn circuit? I have the same issue.
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Old 11-06-2012, 11:16 PM   #5
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Nope, but I can pop the hood and tell you what I did. . .it's been too long since I did it so I don't remember exactly what I did, but I do remember it was pretty simple.
'94 Jeep YJ Wrangler
4.0L I-6/AX-15 5-spd./NP231
2" 4WD Hardware Body Lift

D44 TTB 4WD IFS Conversion w/coilovers & bypasses
4-link rear w/coilovers & bypasses

'49 Jeep Willy's Pick-up Truck
14-bolt rear/D60 front 2/40" BFG MTR's on H2 8-lugs
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Old 11-07-2012, 08:06 AM   #6
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I have not looked at any of the diagrams but one simple way to wire the horn (or most anything that is going to draw more amps than originally intended ) is to have the wire that goes to your horn now controling a relay that you add to supply the power to your new unit

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