Robert,
First check that the indicator bulb isn't just burned out. If its ok, check the
voltage at the bulb. If the voltage is ok, put a new bulb in anyway. If the
voltage is not ok, check the switch on the differential lock. This switch
closes when the differential lock is engaged (knob pulled). If this switch is
faulty your indicator light will not come on. The switch is located on the
driver's side of the transmission on the differential lock shaft. While you are
back under the van, check that the differential lock really is engaging and
disengaging correctly and give the rubber boot a shot of light lubricant.
Larry
'86 Syncro Westfalia

Robert Rountree wrote:

> My light on the dash that comes on when I pull out the Syncro lock knob...
> doesn't come on now, the def lock seems to still be working, all fuses seem
> OK, in the manual it says see your service manager if this happens.... any
> suggestions?
>
> Rob
> 87 Westy SyncroGL