Unplug the green wire from the LED panel to the sender near the tank.
Unplugged, should show no lights.  Grounded, should show green light.

If YES, you've either got a few drops of water inside the sender (probably
from the wire entrance) or a busted reed switch inside it from bending the
wand ever so slightly in the wrong direction (I *hope* that the presently
available wands have the reed switches soldered with a little slack in the
leads -- I had a long conversation with Trevor about this when he was
setting up to make them again.  Either one is fixable with considerable
effort.

If NO, replace left-hand LM324N chip on LED panel.  Digikey has them for a
buck and change.  Clip the chip off the board using small dykes, then
desolder the legs individually.

Yrs,
d

On Thu, Jun 13, 2019 at 8:02 PM David McNeely <davmcneely40@gmail.com>
wrote:

> Hello list, This is trivial compared to many requests for information or
> help, but they would be appreciated anyway.  The water level for the
> potable water tank in my 1991 Volkswagen Vanagon Campmobile reports the
> water level at the intermediate yellow light, no matter the actual water
> level (full, empty, whatever).  I have tried manipulating the float to see
> if that changes things.  No, it doesn't.  It is only an inconvenience for
> this not to work, but I would like it to, just like it used to.  Do I need
> a new float/sensor, and if so, is this item available from anywhere?
>
> Thanks, mcneely
>