1999-2007 General QuestionsGeneral questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.
Have a 2002 F350 w/7.3 crewcab swb. Honked the horn & now it won't stop blowing. Finally found the horn..(Ford hid it good under the wheel housing), tested it & couldn't get it to blow after I took it out. Replaced it with an aftermarket horn but still have the same problem....won't stop blowing after I installed it. I could hear a relay clicking on the backside of the fuse box when I hit the horn....so I took fuse box off but can't find a relay....is it built into the fuse box itself....please say NO....any ideas?
From the service manual: Horn relay: in Central Junction Box (CJB), (not serviceable)
If you find that the relay is the problem, I think I'd be bypassing the CJB and installing a standard relay in the horn circuit.
The horn output from the CJB should be a yellow/lt green wire coming from pin # 9 on the CJB connector, and the wire coming from the horn button and VSM is Dark green at Pin #19 on the CJB connector.
Is the only other option to replace the main fuse box?
Probably, if it turns out that the built-in relay is sticking. Make sure that it isn't something else first (like a shorted wire or stuck horn button). I don't like the thought of replacing the main fuse box. It'd probably sound like all the cash in your wallet getting sucked out.
I had a similiar problem with my truck. Every time that I would turn the wheel hard left, the horn would blow. It would quit once I straightened the wheel back out. Turned out it was a clockspring like frdlvr30 mentioned.
Just had the same experience on my non-diesel 92 econoline. Horn would blow sometimes when steering wheel was turned. Finally, horn stuck on full time when pulling into Home Depot parking space. I determined it was the clockspring by first removing the steering wheel & disconneting the horn button from the clockspring. Horn still blew constantly. Then I disconnected the clockspring harness at the bottom of the steering column, under the dash. Horn finally stopped blowing. In my case clockspring from Ford was ~$100; air bag, steering wheel, & steering column shroud, lower dash pannel, & ignition lock had to removed to replace clockspring asssembly. Also, one cloackspring harness connector could not be accessed, so I cut 3 leads & spliced into old harness.
My only blows when I hit the horn button & then won't stop blowing....haven't had time to look at it yet. Anoter mechanic said it may be the horn button itself sticking...which he said is part of the airbag assembly & the whole unit needs to be replaced ($1,000) if that is the problem. I really appreciate all the input....gives me numerous things to look at when I get time to check it out.
I had that issue also. Never figured it out, but I did put a switch on the wire from the clock spring to the relay (dark blue on a 2005). I can now turn the horn off when I get out of the truck so it won't mysterioulsy stay honking when I'm sleeping.
Marc
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2005 F-250 Supercab 4x4 Lariat long bed 6 speed, Vegistroke V3 WVO system, integrated brake controller, upfitter switches, TTM, South Texas Outfitters custom front end replacement, Whelen Liberty LED lightbar, Whelen Dominator LED front bar, hidden front strobes, rear LED's and strobes, Rhino liner, Whelen 200 watt siren, Havis Consolidator console, and other hidden goodies. Pictures are in "Shoebox" album. http://community.webshots.com/user/vtfireftr
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