Horn not working
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Elder User
Joined: Aug 2000
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From: Burke VA
Horn not working
Hey guys,
I'm stumped by my horn. So the horn out of the steering wheel has a blue hot wire and a yellow/green stripe wire as well. Both go down to the turn signal connector but there is no wire coming out of the harness that attaches to yel/grn wire . So, we ran a wire from it to the horn. When I press the horn, the relay clicks, that's it. I'm stumped as to why there is no line going from the horn button out to the relay. And why would I not have horn by splicing onto the yellow/grn stripe wire directly to the horn??
The horn works, we jumped the relay and it blew.
ANy suggestions/help welcome!
I'm stumped by my horn. So the horn out of the steering wheel has a blue hot wire and a yellow/green stripe wire as well. Both go down to the turn signal connector but there is no wire coming out of the harness that attaches to yel/grn wire . So, we ran a wire from it to the horn. When I press the horn, the relay clicks, that's it. I'm stumped as to why there is no line going from the horn button out to the relay. And why would I not have horn by splicing onto the yellow/grn stripe wire directly to the horn??
The horn works, we jumped the relay and it blew.
ANy suggestions/help welcome!
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,157
Likes: 5,786
From: S/W Missouri, Polk county
I believe so, look for a jumper strap.
Bottom middle of diagram 1 shows blu/yel to horn relay
L/H side/middle/between the headlights of diagram 2, shows duel horns and blu/yel in and yel/grn out
Bottom middle of diagram 1 shows blu/yel to horn relay
L/H side/middle/between the headlights of diagram 2, shows duel horns and blu/yel in and yel/grn out
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Elder User
Joined: Aug 2000
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From: Burke VA
Ok, Thanks for the diagrams. Im looking at Diagram 1 and I'm seeing the yellow blue wire going from the horn relay to the turn signal switch. However, mine is a yellow green wire and ends at the switch. So It comes out of the horn button, down the column, and then the connector has no wire to let it continue out to the relay.
So we figured this was wrong and we ran a wire from the yellow/green direct to the relay, it only clicked.
Do you thinnk theres a ground strap at the rag joint that could be jacking me up?
So we figured this was wrong and we ran a wire from the yellow/green direct to the relay, it only clicked.
Do you thinnk theres a ground strap at the rag joint that could be jacking me up?
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Elder User
Joined: Aug 2000
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From: Burke VA
I did a search and you are not the only one who has said this - so I will ground it tonight. I am still wondering though why my yellow green wire stops at the turn signal harness. very odd, IMO.
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Moderator & parts slinger
Joined: Feb 2007
Posts: 50,157
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From: S/W Missouri, Polk county
I am pretty sure too, but no idea on the harness wiring issue. Shoot a PM to fmc400 or mikeo0o0o0 they are way better than me on this one.
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Elder User
Joined: Aug 2000
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From: Burke VA
No prpblem and thanks for your help. I wonted to post about the different column in case anyone else ran into the same issue Put a 78 or later column w/turn signal switch in your 77 or ealier, and your horn wont work!
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
The way the 73-77 system works is:
The horn relay has three wires that go to it, yellow-constant hot, blue w/ yellow trace-ground to horn pad, yellow w/ green trace- power to horn.
The relay is constantly hot. when you press the horn pad, you're grounding the relay, this turns the relay on and energizes the yellow/green wire that goes to the horn(s).
The steering column is electrically insulated from the rest of the truck, so if you replace the rag joint, that usually eliminates the ground path for the horn switch and the horn won't work. Adding a jumper that crosses the rubber insulator disc usually restores the path.
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Elder User
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From: Burke VA
That's what I had read but that did not work in my case - and I think it's because I have a steering column from a 78 in mine. There was a wire coming off the horn down to the harness but nothing at the harness.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
When you mix 'n match parts, sometimes you need to get creative. It becomes a case of if it works, don't mess with it.
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