The black tank was showing normally last week (along with all the others) on the Javelina display panel. Though now the black tank doesn't register any level at all; however, both fresh an grey water and fresh still are function normally.
So I wonder if there are tank wall sensors that fell off - really, all of them? No reading at any level.
I have caused no mechanical disruptions lately because we have been parked the whole time. I even flushed the black tank several times with forceful water through the stool.
Hum...not sure where to begin looking. Broken connection? Suggestions??
Jim
If this is a Javalina system, the tank sensors are pressure transducers screwed into fittings on the plumbing. They read the hydrostatic pressure of the tank itself and output voltage to the Javalina computer that translates that to the calibrated tank level. They are not tape-like sensors mounted on the tanks like the SeeLevel ones.
To get to the black (and grey) tank sensors, you have to disassemble the utility bay of the coach. The sensors are behind it. In the attached photo, you will see a white hex-nut device with black cap that has wires going from it on the left and on the right sides in the photo. Those are your tank sensors. DO NOT REMOVE THEM UNLESS THE TANKS ARE COMPLETELY EMPTY
There are no replacement Javalina sensors available. Most go with a complete SeeLevel system as an upgrade when failure occurs.
Michelle,
I was afraid of that. Guess I will tap on it to see if it will come out of its funk. On a 2002 where night this pressure sensor be located besides externally somewhere in the tank plumbing? It appears buried in the coach.
Jim
It is buried in the coach. As I mentioned in my earlier reply, they are behind the back wall of the utility bay where the dump valve handles, faucet, cable outlets, etc. are. You have to disassemble all that attached stuff, cut the caulking on the panels, and remove the back wall to get to it. After you remove all of that and gain access, the photo I posted is what you will see.
My black tank sensor is located in the water manifold bay on the passenger side. The sensor is actually fairly easy to see and access without taking much out.
The grey tank sensor is another story!
You might get lucky and take it out and clean it, but probably not. I would try it first.
So in your '02 it's in the same bay as the fresh water sensor?
That IS a lot more convenient than in an '03.
I think that it depends on the layout of the coach. Most have both sensors on the drivers side behind the wall like Michelle said.
Wow, good answers from you guys...thank you! I will search for the sensor in the daylight tomorrow. Wish me luck that it is just clogged up.
Jim
Jim, the black tank sensor seems to be an earlier victim to sludge than the others. It my be possible to remove it and clean it and have it regain function. I looked at mine, pitched it, plugged the hole and put in a SeeLevel system. More reliable, more accurate.
I don't have the coach at the house, but you can see the fresh water sensor in this picture and the black tank sensor is behind the white door. You would need to remove just the carpet cover around the water manifold to access the valve and sensor.
I took a picture through the white access door in my previous post. You can see the black tank sending unit. I hope this helps.