Horn electrical circuit problems
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Joined: Dec 2003
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From: North Texas
Horn electrical circuit problems
I have a 1975 F250 I just picked up, and I am having a problem with the electrical circuit for the horn.
Here is my question. After pulling off the wheel, there is a "plunger" button that seems to make contact with a metal ring in the back of the steering wheel. I assume that by pressing the horn button, that it completes a circuit to ground.
My problem is that the circuit is completed anytime the wheel is replaced. (horn will honk constantly) Upon taking the wheel back off, I notice that the "ring" that the plunger contacts( on the back of the steering wheel), has continuity to other parts of the steering wheel, that would constitute a complete circuit?
My question is this....should there be some type of insulating material between this "ring" and the area that the steering rod comes through. If not, then how is the circuit broken, when there is obviously a short from one place to the other?
Here is my question. After pulling off the wheel, there is a "plunger" button that seems to make contact with a metal ring in the back of the steering wheel. I assume that by pressing the horn button, that it completes a circuit to ground.
My problem is that the circuit is completed anytime the wheel is replaced. (horn will honk constantly) Upon taking the wheel back off, I notice that the "ring" that the plunger contacts( on the back of the steering wheel), has continuity to other parts of the steering wheel, that would constitute a complete circuit?
My question is this....should there be some type of insulating material between this "ring" and the area that the steering rod comes through. If not, then how is the circuit broken, when there is obviously a short from one place to the other?
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Joined: Jan 2001
Posts: 56,973
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From: Virginia
Your right. The circuit should be insulated around the plunger, and the ring. It should pick this insulated circuit up in the wheel itself, and transfer it to a metal spring washer or something that stands above the metal part of the steering wheel where the nut is. Contact is made to the end of the steering shaft when the button is pushed, which is grounded through the rag joint and steering box.
