I have an SLX250 with the above panel control and indicator panel (same as on the SLX270). My issue is the indicator should show EMPTY/HALF/FULL, but only shows POWER when I turn the key to on. No indication of the level in the holding tank.
My question is what is the likely issue? The wiring to the panel is intact and I assume with the POWER indicator on, there is electrical source as required.
Can it be a sensor issue on the tank? I haven't tried to check as the access is restricted.
Thanks for any input.
Welcome to the forum.
Yes, there is a tank level detection assembly screwed into the top of the waste holding tank.
On my boat that assembly was hard wired into the boat wiring harness. I modified that to add an inline connector.
When I am cleaning the interior of my waste holding tank I unscrew and remove that level assembly for remote cleaning, off the boat.
Those three spools move up and down, about an inch, to detect empty, half and full. Internal tank crud restricts the required movement, preventing them from proper indication.
Garden hose cleaning, while moving up and down, dislodges the crud, permitting proper operation.
Note one advantage from internal tank cleaning is that permits visual level observation, as a secondary step to validate internal level.
Welcome to the forum.
Yes the waste tank has an internal level detection assembly screwed onto the top.
Those three small cylinders move up and down about an inch during normal operation to provide the indications for empty, half and full.
It is common for crud to prevent proper sensor float motion, causing the described symptoms.
On my 2000 380DA that sensor assembly was hard wired onto the boat wiring harness. I modified that so mine now has an inline connector, to permit easy disconnection and removal from the boat.
When I am cleaning the internal surfaces of my empty waste holding tank I also clean that level detection assembly, using a garden hose and forced up down movement to ensure there isn't any crud on the sliding surfaces.
One advantage to the waste tank interior walls being clean is that permits visual inspection of the waste level through the translucent tank walls.
Note, on my 2000 380DA some service / repair operations require removal of unrelated components for proper access.
It may be that on the SLX 270 there is also a prop rod (like on my boat) that permits detaching the lift lead screw ram. If so, then careful usage of that prop rod would improve holding tank access.
Also the coolant tank placement is also a detriment to holding tank access. Temporary relocation of the coolant tank (w/ the hoses remaining connected) would improve holding tank access.
After reading the horror stories of other boats with varying degrees of success in cleaning and re-animating internal sensors, I find the idea of moving to external capacitive sensors appealing. It would of course be ideal if such could be hooked up to the existing control panel rather than installing a complete parallel system.
I'd be interested to hear if anyone has managed to realize such a solution - achieving signal compatability for the indicator EMPTY/HALF/FULL.
Done some more research on external sensors that may hook up to the existing monitor. One is a set of 3 sensors, example supplier
where each sends a signal at 12v (0v for no liquid sensed). This would align to the 3 wires from the reed sensors of the standard sensors in the tank. The only difference is that the latter just closes the circuit of the 12V LED on the panel back to -ve for each level.
The question now is whether the signal wire from the external sensor is compatible (circuit-wise) to light up the LED, and not blow any fuses. Any experts out there that can comment?