The dif. lock is controlled by vacuum. This maybe your problem, as the
valves are known to leak. It maybe holding the servo in between. On the
other hand, the pluger in the the axle are also known to rust, and if
not used often will lock, but not unlock. Finnally there maybe just
be a short in the switch located near the servo or in the wiring.

            Eric                   86-VW4x4
            vw4x4@fyi.net          72-240z
            Pittsburgh, PA USA     1936-Chrysler

On Sun, 26 Dec 1999, mike g. wrote:

> Being eager to test the traction capabilities of m new syncro I drove
> onto a road with about 1 foot of snow.  Things were going great until I
> veered off of the road and into a deeper area where after spinning the
> wheels  and rocking back and forth I managed to get high-centered.
> Anyhow, after I managed to dig myself out I returned to the roadway and
> the diff lock light will not go out!  I can push the knob in and out but
> no go!  After about 80 miles on the freeway returning home the light
> flickered and went out, but as soon as I cheered it flickered and went
> back on again.
> Right now it doesn't seem that there is a whole lot of wheel dragging
> going on when I turn corners.  Does anyone know why this light will not
> go out?  Will anything other than tire wear occur while driving with the
> diff locked?  Help!!!
>
>
> Mike Garske
>
> '88 syncro
>