Originally Posted by Jestus
We recently bought 2016 SportTrek. It was used, but in great shape. We've had it out three times and we're having an issue with the grey tank indicator showing full when the tank is empty. I've also noticed that when the tank is full and I open the dump valve it seems to drain slowly.
We've tried filling 3/4 and adding a cup of Dawn dish soap. No help. Any other ideas?
My 04 Dolphin had had the black tank read 2/3 full since I bought it. Previous owner gave up on the problem.
I replaced the probes. While doing that I noticed on top of the tank that the 4 probe wires go into a "black tube full of silicone" and come out the other end with two wires into a plug, then into the harness. On a whim I unplugged and checked the board. Black is still 2/3. Which would indicate a short.
I left the black tank unplugged and went on a trip. Gray tank did not register at all and the black tank occasionally flickered full. One morning before leaving the park I had a blinding senior moment, I plugged the black tank back in and then the gray tank registered. Black tank still at 2/3. Some where I believe there is a short and am not able to find. I would like to have a set of wiring diagram that show the path from probe to meter. Maybe some overpaid laborer at the factory put a screw through the wire.
Last year I removed the water distribution plate to find the FW pump.
I moved the pump to a more accessible location. During the process I found a big rats nest. Cleaned out the nest and removed all remnant of mice / rodents.
My thought is that this pack rat was building a nest with the previous owner and in the process, chewed some insulation. Now I need to find the "snack bar " and repair. Which is why I want to find a book that has detailed wiring schematics for this model coach. And, naturally, National is gone and so are all their tech support documentation.
The point of this long winded saga is that in addition to blocked drain, and plugged up probes, you may have a short somewhere between probe and meter. It could not hurt to research that possibility.