"The windshield washer indicator operates similarly [to the coolant sensor] but uses a float type sensor. When the monitor senses a constant battery voltage at its input it will enable the low light."
Thats from a article on the VMM and its operations and such.
AHHH I must not have the correct set up then.. There is a float in the radiator overflow ... Not in the windshield resivore ..It just clips to the bottom of the resivore doesn't go into the fluid like the rad overflow does...I wonder if it is just a signal blocker and will always give the full sign and be set off even when I'm out of fluild.... I let you know if I get a low light next time it runs out....