Signal Stalk Horn Button ...

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Signal Stalk Horn Button ...

Post by Indiana Drew on Wed Apr 02, 2008 3:01 am

Anyone have an idea of the color of the wires that go to and from the stalk mounted horn button on an early G ('79/'80) scratch
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Re: Signal Stalk Horn Button ...

Post by Indiana Drew on Wed Apr 02, 2008 3:03 pm

Well, to answer my own question - it is the two brown wired at the lower end of the clamp on housing around the steering column ... I still have not discovered where they go from there but I don't know that it matters as long as I can tie a hot wire in one side and a wire running back to the horn on the other. I have a feeling it ran through a relay, but have no way of confirming it without some help ...
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Re: Signal Stalk Horn Button ...

Post by DUTCH on Wed Apr 02, 2008 3:19 pm

Indiana Drew wrote:Well, to answer my own question - it is the two brown wired at the lower end of the clamp on housing around the steering column ... I still have not discovered where they go from there but I don't know that it matters as long as I can tie a hot wire in one side and a wire running back to the horn on the other. I have a feeling it ran through a relay, but have no way of confirming it without some help ...

Be careful. Brown is almost universally a ground wire on German vehicles.

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Re: Signal Stalk Horn Button ...

Post by Indiana Drew on Wed Apr 02, 2008 3:36 pm

DUTCH wrote:Be careful. Brown is almost universally a ground wire on German vehicles.

I will keep that in mind ... The horn is grounded by the mount to the body and the brown or burnt sienna colored wires go through the original horn button on the end of the stalk. I just don't yet know from and where they go. Next stop will be the fuse holder as the bundle coming out of the stalk dives in above it. As the steering wheel was updated but the male side of the rotary contact setup was not installed, that also might be a way to restore the horn to working order. I think it is #08 on the drawing and on the newer Gs. Here is the link ...

Oh and Dutch - thanks for answering - I began to feel I might be "a voice crying in the wilderness ..." :suspect:
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Re: Signal Stalk Horn Button ...

Post by mb230s on Wed Apr 02, 2008 11:13 pm

Most horns operate on a negative trigger vs. positive.
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Re: Signal Stalk Horn Button ...

Post by Indiana Drew on Wed Apr 02, 2008 11:17 pm

mb230s wrote:Most horns operate on a negative trigger vs. positive.
If it were a negative trigger, would the horn not be isolated from the frame/ground?
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Re: Signal Stalk Horn Button ...

Post by Bill K on Thu Apr 03, 2008 6:58 am

http://dieselgiant.com/mercedes%20horn%20troubleshooting.htm
Might help you
Good luck
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Re: Signal Stalk Horn Button ...

Post by Indiana Drew on Thu Apr 03, 2008 8:51 am

Bill K wrote:http://dieselgiant.com/mercedes%20horn%20troubleshooting.htm
Might help you
Good luck

Ah - now I get it! I am sure this will help ... Thank you Bill!
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Re: Signal Stalk Horn Button ...

Post by mb230s on Thu Apr 03, 2008 9:02 am

Indiana Drew wrote:
mb230s wrote:Most horns operate on a negative trigger vs. positive.
If it were a negative trigger, would the horn not be isolated from the frame/ground?

Yep - hence the two wires. Not 100% this is true for a G but it is for most other old MBs I've come across.
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Re: Signal Stalk Horn Button ...

Post by Indiana Drew on Thu Apr 03, 2008 9:14 am

The picture is now becoming clearer - I know what is happening at the horn and the button ends of the system - just not sure what the pre-import owner did in between ...
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