Quote:
Originally Posted by wherewolf17
I've given up on the black tank sensor. If I get it to stop saying full all the time, it goes back to saying full even if it wasn't used since dumped. I'll look down the hole for now, just like I did on my 1986.
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The level lights work by the water in the tank acting as a ground so if there is a clump of wet toilet paper stuck to a sensor it is grounded and the light will stay on.
Only three things can cause the light to stay on. a bad light board, a grounded wire, or a clump of wet TP/etc. stuck on the sensor.
You can start checking by disconnecting the wires where where they attach to the sensors on the side of the tank. If the lights go out, the problem is inside the tank, if they stay on, either the wire is grounded somewhere between the tank and the display, or the display is bad. Check the display by disconnecting the wiring there. if the lights go out, the problem is a grounded wire
If the problem is in the tank do the following:
When the tank gets 2/3 full toss in a 20 pound bag of crushed ice and a quarter cup of laundry detergent, and a quarter cup of "Rain Drops Water softener and Detergent Enhanser" (or any brand of water softener additive) and drive around for an hour or so allowing the ice to slosh around and act like a washing machine. Then drain the tank and allow the walls to dry out a couple days. If the lights still stay on, there is still a wad of wet toilet paper that needs to be removed.
If you have a black tank backwash use it every time you empty your black water tank.
Run it till the tank is almost full, then continue to run it while the tank is emptying, leave it running and shut the dump valve. allow the tank to almost fill again and let it drain again with the backwash running the entire time the tank is emptying. continue doing this until nothing but clear water is coming out of the drain.
PS:..Pick up one of those see through drain pipe adapters so you can see whats coming out of the drain while emptying your tanks.
Make sure you have about 5 gallons of water in your black tank before using it. Add a quarter cup of water softener to that five gallons and a quarter cup of laundry detergent. the sloshing around while driving will wash the walls and keep rust from building up on the sensors. Never empty the tank till its at least 2/3 full and always use your black water backwash if you have one. Also always drain the black tank first and then the grey tank.
Hope this is of some help