Windshielswasher fluid warning light on

["Meron" <phwomp@cosmoslink.net>]

To all,
The windshield "low fluid warning" is on and will not go off...

Symptom: windshield cleaning fluid warning light is on (car is 86 5Kcstq)

Corrective measures performed:
1. add fluid, warning still on
2. remove sensor and clean contacts, performance OK (with OHM meter) floats
is OK, warning light still on
3. unplug sensor, warning light still on 
4. shorten sensor plug (jump the wires), warning light is still on
5. remove ground battery terminal for a few seconds and reconnect, warning
light is on

Any other suggestions before I "tear into the electrical heavy" ?

TIA

Avi Meron