[T3] Horn Issue

[Max Welton]

So the tank is pumped empty and removed. It's nice to have an electric pump.

https://www.thesamba.com/vw/gallery/pix/2648103.jpg

I measured ~71 ohms between the shaft and the chassis. OK, maybe the
wire is chaffed inside the tube. Disconnect the wire and test again.

Still 71 ohms. I would not have suspected the disk itself. It's just
rubber, right?

https://www.thesamba.com/vw/gallery/pix/2648102.jpg

Max

On Sat, Jan 31, 2026 at 11:37 AM Jim Adney <jadney at vwtype3.org> wrote:
>
> On 30 Jan 2026 at 16:08, Max Welton wrote:
>
> > I may have just found my problem. The steering shaft is NOT completely
> > isolated from the chassis. I'm measuring just under 70 ohms. So it looks
> > like the tank is coming out so I can check the rubber "rag" joint.
>
> Yes, it should be isolated, and have you confirmed that this shaft is directly
> connected to the (red?) wire coming from the horn? It should be. Sounds like
> it is.
>
> You can check the flex coupling rather easily from below. The wire coming
> down the center of the hollow steering shaft should be grounded, and it can
> abrade against something as it comes down the shaft or as it exits the hollow
> shaft just before it jumps across the flex coupling. Sometimes, all it needs is
> to be "bent" a bit to push it away from where it has been wearing.
>
> Starting in '68, the lower part of the steering shaft was replaced by an
> expanded metal crush tube, that offered better protection in a head-on
> collision. The center wire still comes down the shaft and crush tube and
> jumps across the flex coupling. It can still get shorted there.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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