Horn Ground Problem
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Horn Ground Problem
My truck has been sitting since January because the inspection has been out.
Couldn't get the horn to work for the life of me, so Saturday I set about troubleshooting.
Applying power directly to the horn would make it sound, so I knew the horn was good.
I had installed a Grant steering wheel, so I rented a puller and pulled it off, and spent Saturday trying to figure out what was wrong.
I replaced the horn relay, but that didn't do it.
After several frustrating hours, I figured out the horn wasn't grounded correctly.
If I would bridge the brushes with a screwdriver and touch the shaft, it would not sound, but if I bridged the brushes and touched the steering column, the horn would sound.
I finally found a thread on here about grounding the rag joint.
THREAD:https://www.ford-trucks.com/forums/8...rag-joint.html
I cleaned up my rag joint with a wire brush, and that seemed to do the trick. Horn works great now.
Just to be safe, I ran a wire from one side of the rag joint to the other like this:
Hope that helps someone in the future.
After that, I got her inspected and washed her up.
Cleans up pretty good (From about 10 feet).
Couldn't get the horn to work for the life of me, so Saturday I set about troubleshooting.
Applying power directly to the horn would make it sound, so I knew the horn was good.
I had installed a Grant steering wheel, so I rented a puller and pulled it off, and spent Saturday trying to figure out what was wrong.
I replaced the horn relay, but that didn't do it.
After several frustrating hours, I figured out the horn wasn't grounded correctly.
If I would bridge the brushes with a screwdriver and touch the shaft, it would not sound, but if I bridged the brushes and touched the steering column, the horn would sound.
I finally found a thread on here about grounding the rag joint.
THREAD:https://www.ford-trucks.com/forums/8...rag-joint.html
I cleaned up my rag joint with a wire brush, and that seemed to do the trick. Horn works great now.
Just to be safe, I ran a wire from one side of the rag joint to the other like this:
Hope that helps someone in the future.
After that, I got her inspected and washed her up.
Cleans up pretty good (From about 10 feet).
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Chris Roy
1967 - 1972 F-100 & Larger F-Series Trucks
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Apr 20, 2019 12:12 PM
