| [GMCnet] Horn Wiring [message #196667] |
Mon, 28 January 2013 12:43  |
enate98690
Messages: 23
Registered: January 2012
Karma: 0
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Junior Member |
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Hi Everyone:
I have an interesting electrical/wiring question and I wonder if anyone has seen this issue previously.
Until about 5 months ago, the horn on my 1973 GMC worked great. Then, I used the horn for an extended period - let's say 5 minutes (I am unsure whether the current problem relates to that issue or not). Sometime after that, I noticed the horn was not working.
Because the horn relay was not "clicking" when I pushed the horn button, I replaced that first. Interestingly, when I reconnected all the wiring, the relay still did not click.
When I connect the horns - in isolation (i.e., separate from the relay) - they work fine.
Here's the weird part: I connected all terminals going to the horn's relay terminal. Then I connected test wires to the horn relay positive side and the horn relay's negative side and ---- nothing.
How can that occur? I know that there is positive current flowing to the horn battery terminal.
Any information anyone can provide would be appreciated.
Thanks,
Keith
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| Re: [GMCnet] Horn Wiring [message #196668 is a reply to message #196667] |
Mon, 28 January 2013 13:06  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: Probably the horn button. Yes the relay is hot but the horn button grounds it. On the early style steering wheels usually the grounding spring under the horn button is rusty. Test by using a screw driver to make contact with the cup and the big nut or one of the 3 screws with the plastic button cover off. To repair take the 3 screws out of the plastic spacer and remove (take note which way the wave washer is) and sand and clean the contact area. You can move the washer around to line up a cleaner spot.
Let us know.
| enate98690 wrote on Mon, 28 January 2013 13:43 |
Hi Everyone:
I have an interesting electrical/wiring question and I wonder if anyone has seen this issue previously.
Until about 5 months ago, the horn on my 1973 GMC worked great. Then, I used the horn for an extended period - let's say 5 minutes (I am unsure whether the current problem relates to that issue or not). Sometime after that, I noticed the horn was not working.
Because the horn relay was not "clicking" when I pushed the horn button, I replaced that first. Interestingly, when I reconnected all the wiring, the relay still did not click.
When I connect the horns - in isolation (i.e., separate from the relay) - they work fine.
Here's the weird part: I connected all terminals going to the horn's relay terminal. Then I connected test wires to the horn relay positive side and the horn relay's negative side and ---- nothing.
How can that occur? I know that there is positive current flowing to the horn battery terminal.
Any information anyone can provide would be appreciated.
Thanks,
Keith
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Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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C. Boyd
76 Crestmont
East Tennessee
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