Tank gauges - how do they work?
HI there, I am looking to understand the operating principle of the tank gauges, and a possible electrical schematic. In case there are more models out there, i am talking about the one with 4 s...
Forum Discussion
The "standard" OEM button sensors are notoriously bad. If you don't have problems, you are one of the lucky ones. Slime and crud builds up on the tank walls causing false readings. Not sure if any of the TT manufacturers offer an upgrade to the button sensors. The vertical position of these sensors can vary a lot and is only an approximation of the actual tank level. In ours for example, 2/3 is more like 90-95% full. Sometimes the 1/3 sensor is too close to the bottom and even a little slime will say the tank is at 1/3 when it's empty.
We had our dealer install Horst Miracle Probes in our new 2014 TT (on 3 tanks). They had to pull down the coroplast underbelly material to get access. I installed these probes on a previous TT without an enclosed underbelly and it only took about 15 minutes. The dealer said it took them hours to do our new TT. (Haven't got the bill yet - thankfully) If you are installing Horst probes yourself, you could leave the old ones where they are if desired and install the new ones closer to the elevations they ought to be at. We've found that the Horst probes are a big improvement.
I now use our built-in tank flusher to get the inside of the black tank spotless. I've found that getting a black tank decently clean is not that easy and I keep flushing repeatedly until I see the black bottom of the tank and droplets of ABS glue. If you see white down there (TP), it's not clean enough. I suspect many don't get their tanks clean enough after a camping trip which will increase false readings. An occasional cleaning with the right chemical would help.
With thorough tank cleaning now, we get 4 days out of our black tank for two of us and the Horst Miracle probes are perfectly reliable. WE used to get only two days out of the same tank, sometimes less.
We had our dealer install Horst Miracle Probes in our new 2014 TT (on 3 tanks). They had to pull down the coroplast underbelly material to get access. I installed these probes on a previous TT without an enclosed underbelly and it only took about 15 minutes. The dealer said it took them hours to do our new TT. (Haven't got the bill yet - thankfully) If you are installing Horst probes yourself, you could leave the old ones where they are if desired and install the new ones closer to the elevations they ought to be at. We've found that the Horst probes are a big improvement.
I now use our built-in tank flusher to get the inside of the black tank spotless. I've found that getting a black tank decently clean is not that easy and I keep flushing repeatedly until I see the black bottom of the tank and droplets of ABS glue. If you see white down there (TP), it's not clean enough. I suspect many don't get their tanks clean enough after a camping trip which will increase false readings. An occasional cleaning with the right chemical would help.
With thorough tank cleaning now, we get 4 days out of our black tank for two of us and the Horst Miracle probes are perfectly reliable. WE used to get only two days out of the same tank, sometimes less.
