Please measure the following voltages and resistances:
- Voltage between brown wire coming from e-box that would normally connect to the bilge and the e-box itself (GND)
- This should show the same as battery voltage
- Continuity between the black wire coming from e-box that would normally connect to the bilge and the e-box itself (GND)
- Please use the multimeterter setting that creates an audible tone when there is continuity
The multimeter should beep intermittently with the same rhythm that the bilge would usually exhibit.
I am expecting one of these tests to fail as the bilge needs continuous 12V power and then it is cycled on and oﬀ through a MOSFET connecting the black wire to ground.
Worst case scenario you can connect a switch between the black wire coming from the bilge (either side of deutsch connector) and ground. This switch when closed will override the auto-bilge and hold the bilge in the on state. The auto-bilge will then control the bilge once.
Again, when the switch is opened. This will not work if there is an issue with the constant 12V power supplied to the bilge.