Does anyone know the answer to this oddity?  The water tank level indicator
on my 1991 Volkswagen Vanagon GL Campmobile (the one with three lights to
indicate full, less than full, empty or nearly so) has the middle lamp
lighted when the tank is anywhere below almost full.  All the way down to
empty, the middle lamp is lit.  I pulled the sensor out, and slid the float
up and down the stick, and it responds the same way out of the tank as in
it.

I am unclear as to how this thing works.  The float must have a magnet in
it which interacts with an electrical unit inside the stick.  Maybe it
moves a magnet up and down inside the stick to complete a circuit.  But if
that is the case, why has mine started indicating "half full" when empty?

Could it be that the wiring inside has slipped in its confines so that at
the empty position the half-full circuit is completed?

I would check to see if a new part is available, but first I need to know
what is not working.  Of course, the stick is sealed, so I can't look to
confirm my suspicions.

mcneely