Drat! The water tank level indicator lights stopped working today. None 
of the lights light, no matter what the water level.

The fridge "pilot light lit" light and battery voltage lights still work. 

The top sensor at the tank is getting about .6 volts, the two lower ones 
about .4 volts when the switch is on. 0 when switch is off.

Does anyone know how this circuit works or have a wiring diagram for it?

Thanks, listophiles.

--Dave Garth
  '86 Westy
dgarth@cymbal.aix.calpoly.edu