Horn Troubleshooting

[Wooley Booger]

I am finally getting around to fixing the horn on the '68 F-100 that has not work for years. I recently discovered the horn relay ... it had broken off of the bracket holding it to wheel well. I can make the horn operate by manually closing the relay switch so the horn itself works. But no go from the steering column. I am tending to think it is the relay itself which is corroded to some extent. I've got my multi-tester ready.... what are my troubleshooting options here? Thanks for any input.

[fordman]

when you remove the chrome horn button on the steering wheel do you see a brass colored pin? if not you need that. if its there make sure it is good. it comes right out. it should have a spring and wire connector going throught he spring. try that first and get a new rely bolted on. then see what you get. then we can move on to the wiring. check the plug under the dash coming out fo the steering column for cut wires.

[Thunderfoot]

The horn switch in the column is a grounding circuit... Using your meter, set it for continuity and check the Blue-Yellow striped wire at the relay on the fender to ground. Have someone hit the horn and see if you have continuity to ground. If not then do as Fordman said above...
Here is the wire diagram... http://www.fordification.com/images/sch ... ircuit.jpg

[Wooley Booger]

Thanks for the direction Thunderfoot and fordman... I pulled the horn cap off and buffed up the contacts, checked the wiring harness on the column (no chafing), and picked up a new horn relay at the parts store. It's nice to have the horn back and functioning in its old position again!... I had kluged it as a toggle switch on the ceiling panel for awhile until the toggle broke off.

[flyboy2610]

Mine doesn't work because the relay is missing!

[fordman]

pos do wierd things

[1971ford]

that is 100% correct!