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Sparks when using the horn!
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soiouz
Posted 2017-07-30 2:26 PM (#545172)
Subject: Sparks when using the horn!



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I had the center of the horn ring off today when reinstalling my steering wheel, and as I was checking if everything worked fine I noticed sparks flying off at the contact ring when blowing the horn... pretty sure the horn is not supposed to create sparks, right? Any idea what might be causing this? Some bad ground somewhere?...
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BigBlockMopar
Posted 2017-07-30 3:33 PM (#545180 - in reply to #545172)
Subject: Re: Sparks when using the horn!



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One always disconnects the battery when the steeringwheel is removed.
The horn wire is usually live at all times.
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soiouz
Posted 2017-07-30 4:11 PM (#545183 - in reply to #545180)
Subject: Re: Sparks when using the horn!



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BigBlockMopar - 2017-07-30 3:33 PM

One always disconnects the battery when the steeringwheel is removed.
The horn wire is usually live at all times.


Of course the battery was disconnected when I removed the wheel.

I noticed the sparks when everything was put back on, except the chrome center cap of the horn ring.
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LD3 Greg
Posted 2017-07-30 4:25 PM (#545187 - in reply to #545183)
Subject: Re: Sparks when using the horn!


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Is there any corrosion on the copper ring? Clean it up with a scotchbrite pad?

Greg
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rebel
Posted 2017-08-01 10:37 AM (#545288 - in reply to #545187)
Subject: Re: Sparks when using the horn!


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David,
If a Plymouth is the same as a Chrysler, you should not have power to the horn circuit in the steering column. The horn contact ring is the ground circuit only. On a 58 Chrysler the ignition switch, when turned on, supplies power to the horn relay. The horn contact ring provides the ground, completing the circuit, which closes the contacts in the horn relay, making the horns blow.
Completing a ground circuit should not cause any noticeable sparks.
Hope this helps.
Bob
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Chrome58
Posted 2017-08-01 12:21 PM (#545295 - in reply to #545172)
Subject: Re: Sparks when using the horn!



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David, I noticed the same thing on mine : sparks on the horn ring when making contact.
I thought nothing of it and thought it was part of the way it worked.
Now you got me wondering ...
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wizard
Posted 2017-08-01 1:23 PM (#545302 - in reply to #545172)
Subject: Re: Sparks when using the horn!



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It's very normal to have some sparks when a contact pair is closing the circuit. The contact ring grounds the horn relay coil, so it's low consumption.
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57chizler
Posted 2017-08-01 1:24 PM (#545303 - in reply to #545295)
Subject: Re: Sparks when using the horn!



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That's why they eventually went to horn relays, instead of the high-amperage load being grounded at the horn ring, the horn ring only grounds the low-amperage load of the relay.
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soiouz
Posted 2017-08-01 5:37 PM (#545319 - in reply to #545172)
Subject: RE: Sparks when using the horn!



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Ok, Thanks a lot for the info guys! I won't worry about it anymore then.
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