Either that or the BMFH method.

 

Yep they did it to my vehicle. I was parked under a tree at school for about a week and i come back from a trip and start it up and it sounds funny. so i pop the hood and look underneath it and see that the firewall was chewed up and some of the rubber was bitten, so i take it up to ford and ofcourse they tell me its not covered under warrenty. long story short, i moved to a diff apart and i made sure before i signed the lease that there were no trees near where i was going to park.

 

raining.. hmm I wonder if the 3rd brake light leak might have got on your factory alarm module that's mounted on the rear wall. Sounds weird that the horn relay would go bad with out it being in use at the time. Now if you was honking the horn and it stuck I could understand that.

 

So anyone have any idea what I might should do. I could always cut the wire to the horn, never really use it anyway.

 

I would start with a very thorough inspection of the engine compartment to look for chewed or worn wires. Then get a test light or volt meter and test the horn relay to see if thats a culprit. If the third brake light was leaking your back seat should be soaked. Other than that I have no suggestions. Hope it helps.

 

Just unplug the wire on the horn. YOu can trace the wire back to the horn relay and replace it. Or, Go to the auto parts store and buy a new one and look for something that looks like it.

 

Where is the horn wire located at. Sorry if i sound stupid but its my first ford and first horn problems.

 

look behind the grill, you'll see the horns. I'd pull the fuse for the horn relay too. Check your owners manual for the fuse number.

The 3rd brake light leak didn't get my seats wet. I noticed it running down the inside of my back glass. So don't count that out yet.

 

Thanks for the help Impact. I'll check it out when I get off work.

 

I'm headed to work myself but I'll check the forums there and give any help I can using my alldatadiy.com account.

From looking at my alldata account the horn relay is relay #305 / C2077 and it's one of the smaller relays located to the right in between the bigger relays. The fuse is 20A #f2.26 located on the right side the horn relay both in the fuse box.

The relay works like any standard relay with pins 85, 86, 87, 87a, 30.



on the relay itself check the ohms between pins 85 & 86 you should read 50-100 ohms
Then check ohm between pins 30 and 87a and you should see close to 0 ohms which means closed.
Check between pins 30 and 87 and you should see infinite ohms or nothing which means open.

if that all checks out the relay is good. Next you need to check the wires from the horn switch.

Which is pin 85 inside the horn relay socket, check ohms between that and chassis ground. if you get low ohms the horn switch/wire is faulty.

My alldata account does not go into very good wiring details for the alarm module.

 

1) remove faulty horn
2) replace with 152dB locomotive horns and 200psi compressor
3) raise some hell

 

yea pull the fuse out for the horn for now, i would start by doing some Ohms tests across the lengths of wires.

 

where the hell is the fuse box located in the 04 and ups? i feel like a dumbass

 

Front passenger side kick panel.

 

its kinda like your truck was screaming for help