Today I got my new horn through the mail and decided to put it on. I read the directions and it says you can wire it up to replace your factory horn. It is a small air compressor with tubes going to 2 Horns. I took the factory horns off and replaced them with the new ones. I cut the right horns wiring harness and it revealed 2 wires. (one which loops and leads to the 2nd horn on the left...like a circuit.) Since the Air compressor has a positive and negative I put the 2 lines on the positive (was going to keep one factory horn) and took my negative to the negative side of the battery. OK.... I told the wife to give it a little push and it sounded about a 1/16th of a second and quit...after that nothing. I checked the fuse labled HORN and it was fine. I took everything apart and replaced my factory horns, plugged the wiring harnesses back up and told my wife to push the horn while I held the wires together. No matter which way I held them nothing happened. If anybody has any suggestions please post them...

Thanks a lot!! Black (no horn) Tundra84

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2007 Limited CrewMax 4x2
i-Force 5.7 V8
Sequential shift (console)
Red Rock Interior
22" Panther Rims
285/45 Nitto Tires
FlowMaster 40 Series Exhaust
Rockford Fosgate 800W
4- Focal Door Speakers
10 Inch Sony Flip Down DVD
Billet Grill Insert
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Billet Bumper Inserts
Stubbie Billet Antenna
Xenon Conversion Kit (Hi's and Low's)
Silverstar Fog Lights
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Blue LED's Underneath
Rainguard Vent Visors Smoke
Chrome Third Brake Light with TRD logo
Chrome Door Handles & Tailgate handle
Chrome Side Mirrors
Chrome Oval Step Tubes

Maybe this will help. The second page of it shows the horn fuse and then a relay. Hope it helps, not too good with trouble shooting wiring unless I'm looking at it.

Attached Images

Power%20Source%20Diagrams[1].pdf (72.4 KB, 13 views)

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2007 Tundra DC 5.7 4X4 with very fast Radiant Red slapped on.
Custom painted engine cover(Godzilla)
One set chrome mannly truck nutz.
Putco chrome tow mirror covers and tail gate handle.
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Raptor oval nerf bars.
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Stride, thanks for the help....but i don't have a d@mn clue what all that means..lol I'm a plumber and I know hardly nothing about wiring and fuses. If you or somebody could explain this in (idiots) terms I would appreciate it. Thanks a lot for the help though!!

I'll see your PDF and raise the Horn PDF

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	06700.pdf (11.9 KB, 11 views)
	06700110.pdf (102.1 KB, 10 views)
	06700210.pdf (113.8 KB, 11 views)
	06700310.pdf (190.6 KB, 9 views)
	06700410.pdf (173.9 KB, 10 views)

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HAHAHA! I'm a wiring idiot and know hardly anything about poker either.

If the fuse is good, look at the pdfs squid posted. I think its the 3rd pdf. Check the relay it shows. Atleast thats a good start. The pdf dose say make sure to tape a screw driver whn checking the relay. I'm guessing at this by the diagrams though.

Didn't the same thing happen to someone before? They direct wired the new horn to the factory wiring and it quit working. Don't know what ever came of that.

I would guess it's a fuse somewhere. Check them all. Relay is definitely a possibility as well. Swap the horn relay with another same relay and see if that fixes it. If so, then the horn relay is bad.

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I wonder if the horn has to be mounted for the ground?

The stock ones have to be mounted to get a ground. They ground to the mounting bolt.

See just how my wiring degree made me not relize something this simple. I'd try that for a dollar. I had that happen working on trailer lights once upon a time made me for sometime.