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| [GMCnet] Ground for horn and ignition buzzer [message #180843] |
Sun, 19 August 2012 17:39  |
Sean
Messages: 189
Registered: March 2012
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Senior Member |
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Hi all,
Neither my horn nor my ignition buzzer are working at the moment. They
did work before I brought the coach in to have the fuel system worked
on.
The horn honks if I short the ground directly from the relay, so I
think the relay is fine.
The shop wired up a new electric fuel pump while they had it, and I
suspect they may have disconnected the ground.
Can anyone tell me where the ground connections for the horn and the
ignition buzzer are typically located?
Thanks!
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
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Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180848 is a reply to message #180843] |
Sun, 19 August 2012 18:19  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: does the relay click when the horn is pushed? There is a chance the horn button is rusty, remove the button, 3 screws and spring plate taking note which way is up. Sand and clean. The buzzer switch is under the plastic turn signal canceling thingie. Does the door light come on with key on and door open? You Need to remove the wheel and locking plate for that thing. Both are grounded thru the column as it is bolted to the dash. Some have reported a bad dash ground, I have a dedicated ground to the battery for the dash. JWID | Sean wrote on Sun, 19 August 2012 18:39 |
Hi all,
Neither my horn nor my ignition buzzer are working at the moment. They
did work before I brought the coach in to have the fuel system worked
on.
The horn honks if I short the ground directly from the relay, so I
think the relay is fine.
The shop wired up a new electric fuel pump while they had it, and I
suspect they may have disconnected the ground.
Can anyone tell me where the ground connections for the horn and the
ignition buzzer are typically located?
Thanks!
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180855 is a reply to message #180848] |
Sun, 19 August 2012 19:00 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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Senior Member |
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On Sun, Aug 19, 2012 at 5:19 PM, Charles Boyd <covered-wagon@comcast.net> wrote:
>
> Sir: does the relay click when the horn is pushed? There is a chance the horn button is rusty, remove the button, 3 screws and spring plate taking note which way is up. Sand and clean. The buzzer switch is under the plastic turn signal canceling thingie. Does the door light come on with key on and door open? You Need to remove the wheel and locking plate for that thing. Both are grounded thru the column as it is bolted to the dash. Some have reported a bad dash ground, I have a dedicated ground to the battery for the dash. JWID
Thanks for the reply, Charles!
The door light hasn't worked since I purchased the coach in March.
The relay doesn't click, but I'm not ready to believe that the horn
button is rusty. It worked fine 4 months ago, and I just can't imagine
it going rusty in that much time down here in dry, dusty, southwestern
New Mexico.
I mean, sure, it's a possibility, but I'm inclined to poke around a
bit more under the dash before I tear the column down. The folks that
worked on it definitely weren't experts with these old GMC's, and I'm
really suspicious that they might have messed this up on accident.
Burns me up too, because the horn was the very first thing I fixed
when got the coach! :\
What would be some other symptoms of a bad dash ground?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
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Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180859 is a reply to message #180855] |
Sun, 19 August 2012 19:30 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Other stuff acting up like gauges or dash lights would indicate a bad ground. If you think it is a ground issue take one jumper cable and clamp on the column where it bolts to dash and other end to coach battery ground thru the hatch cover. Another place to look is the flat 10 wire plug on top of the steering column under the dash. It might not be plugged in good or corosion?? The horn if famous for rusting from a roof leak that drips right on it. Jiggling the key sometimes brings back the buzzer. To get to the door light remove the back cover and check the info center circuits. Mine was burnt up.
| Sean wrote on Sun, 19 August 2012 20:00 |
On Sun, Aug 19, 2012 at 5:19 PM, Charles Boyd <covered-wagon@comcast.net> wrote:
>
> Sir: does the relay click when the horn is pushed? There is a chance the horn button is rusty, remove the button, 3 screws and spring plate taking note which way is up. Sand and clean. The buzzer switch is under the plastic turn signal canceling thingie. Does the door light come on with key on and door open? You Need to remove the wheel and locking plate for that thing. Both are grounded thru the column as it is bolted to the dash. Some have reported a bad dash ground, I have a dedicated ground to the battery for the dash. JWID
Thanks for the reply, Charles!
The door light hasn't worked since I purchased the coach in March.
The relay doesn't click, but I'm not ready to believe that the horn
button is rusty. It worked fine 4 months ago, and I just can't imagine
it going rusty in that much time down here in dry, dusty, southwestern
New Mexico.
I mean, sure, it's a possibility, but I'm inclined to poke around a
bit more under the dash before I tear the column down. The folks that
worked on it definitely weren't experts with these old GMC's, and I'm
really suspicious that they might have messed this up on accident.
Burns me up too, because the horn was the very first thing I fixed
when got the coach! :\
What would be some other symptoms of a bad dash ground?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180860 is a reply to message #180843] |
Sun, 19 August 2012 19:33 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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OK. I'm looking at the wiring diagram. There is no ground wire for the steering column. The steering column is grounded by it's mounting. If the relay works and the horn honks when you ground horn relay pin 2 (16 gauge black wire), then you have a problem with the black wire on pin 2 going to the horn button or in the horn button itself.
Depending on the steering wheel type I would remove the horn button and try grounding the wire directly to the steering wheel frame. If it honks, then you have a horn button problem. If it doesn't honk, then you have an open between the horn button end of the wire and the relay itself. I see by the wiring diagram that is not one solid wire. It has two connections along it's route back to the relay. There is also a round brass slip ring connection in the steering column that could be dirty or tarnished.
HTH
Ken B.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180867 is a reply to message #180860] |
Sun, 19 August 2012 20:15 |
Sean
Messages: 189
Registered: March 2012
Karma: 0
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Senior Member |
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On Sun, Aug 19, 2012 at 6:33 PM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> OK. I'm looking at the wiring diagram. There is no ground wire for the steering column. The steering column is grounded by it's mounting. If the relay works and the horn honks when you ground horn relay pin 2 (16 gauge black wire), then you have a problem with the black wire on pin 2 going to the horn button or in the horn button itself.
>
> Depending on the steering wheel type I would remove the horn button and try grounding the wire directly to the steering wheel frame. If it honks, then you have a horn button problem. If it doesn't honk, then you have an open between the horn button end of the wire and the relay itself. I see by the wiring diagram that is not one solid wire. It has two connections along it's route back to the relay. There is also a round brass slip ring connection in the steering column that could be dirty or tarnished.
Grounding from pin 2 on the relay honks the horn.
Grounding from the horn button wire on the column-side of the harness
("18 BLK" on the diagram to the right of the 11-way connector, 3rd
wire up from the bottom on the left side at http://goo.gl/zt7eP) also
honks the horn.
That's as close as I can get to the button without tearing apart the
steering wheel, so I guess it's the button after all.
Time to get a wheel puller, I guess?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
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Sean
1973 260 Painted Desert
Luna County, NM
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180870 is a reply to message #180867] |
Sun, 19 August 2012 20:28 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Might as well get a locking plate spring compressor while you're at it.
You shouldn't need it for the horn button repair, but you might as well
clean up the ignition key warning switch while you're in there.
And if you have any play in the steering, replacing the column nylon pivot
ball might be helpful.
Ken H.
On Sun, Aug 19, 2012 at 9:15 PM, Sean F wrote:
...
>
> That's as close as I can get to the button without tearing apart the
> steering wheel, so I guess it's the button after all.
>
> Time to get a wheel puller, I guess?
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180873 is a reply to message #180867] |
Sun, 19 August 2012 20:36 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Sean wrote on Sun, 19 August 2012 20:15 |
On Sun, Aug 19, 2012 at 6:33 PM, Ken Burton <n9cv@comcast.net> wrote:
That's as close as I can get to the button without tearing apart the
steering wheel, so I guess it's the button after all.
Time to get a wheel puller, I guess?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
|
Take a good look at the horn button. Mine is removable without pulling the steering wheel. If fact I have to remove the button to install the steering wheel puller.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Ground for horn and ignition buzzer [message #180880 is a reply to message #180867] |
Sun, 19 August 2012 21:24 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: if you have the original steering wheel just take a screw driver and pry the horn button cover off and you will see the 3 phillips screws. Ground the ring to the steering wheel metal and see if it works.
| Sean wrote on Sun, 19 August 2012 21:15 |
On Sun, Aug 19, 2012 at 6:33 PM, Ken Burton <n9cv@comcast.net> wrote:
>
>
> OK. I'm looking at the wiring diagram. There is no ground wire for the steering column. The steering column is grounded by it's mounting. If the relay works and the horn honks when you ground horn relay pin 2 (16 gauge black wire), then you have a problem with the black wire on pin 2 going to the horn button or in the horn button itself.
>
> Depending on the steering wheel type I would remove the horn button and try grounding the wire directly to the steering wheel frame. If it honks, then you have a horn button problem. If it doesn't honk, then you have an open between the horn button end of the wire and the relay itself. I see by the wiring diagram that is not one solid wire. It has two connections along it's route back to the relay. There is also a round brass slip ring connection in the steering column that could be dirty or tarnished.
Grounding from pin 2 on the relay honks the horn.
Grounding from the horn button wire on the column-side of the harness
("18 BLK" on the diagram to the right of the 11-way connector, 3rd
wire up from the bottom on the left side at http://goo.gl/zt7eP) also
honks the horn.
That's as close as I can get to the button without tearing apart the
steering wheel, so I guess it's the button after all.
Time to get a wheel puller, I guess?
--
Sean
1973 260 Painted Desert
Luna County, NM
Gallery: http://goo.gl/Gfcpd
_______________________________________________
GMCnet mailing list
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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