Puzzled By Waste Tank Read Out?

MonacoMike

Well-Known Member
Sep 15, 2009
14,721
Indiana lakes and Lake Michigan
Boat Info
2000 Cruisers 3870
8.2 Mercs
Engines
85 Sea Ray Monaco 197
260hp Alpha 1
I cleaned and repaired two of the tube type sensors and replaced a broken one. When I hooked everything up the readout was odd. When the tank was empty the mid low light was on, when the tank was mid low the empty light was on. The mid high and full work properly except for the empty light was always on.

I swapped wires with different sensors and all sensors worked exactly the same. I believe there is probably an error in the circuitboard. The circuitboard is called tankwatch 4.

In the end I swap the wires from the circuitboard to the lights so that the tank now shows empty when it is empty, mid full when mid full. However, when the mid high and the full lights are on the mid full light is also on display.

Anyone else have any insight into why this would be that way?

MM
 
Last edited:
quick google of the wiring diagram shows a common ground/supply(?), that goes sensor to sensor, are you sure that wire is right?
 

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