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Re: trailer diagnostic panel
Check the fuses in the fuse panel. If all are good then you will need to verify that you have power to the monitor panel. If power is at the panel then the circuit board is bad or unplugged. If you do not have power you will have to trace the wiring until you locate the failure point. Unfortunately RV manufacturers do not publish wiring diagrams.
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U SHOULD HAVE A BLACK TANK AND A GRAY. TOWARDS THE BACK WERE U HOOK UP THE HOSE FOR DUMPING U WILL SEE TWO LEVERS ONE IS FOR BLACK ONE IS FOR GRAY. AND IF UR TALKING ABOUT FRESH HOLDING TANK LOOK UNDER NEATH AND U SHOULD SEE A PLASTIC NOSEL WITH A TURN VALVE LIKE WHAT BOX WINE HAS TO PURE A GLASS
If you're talking about the drain valves, most RVs have them on the left side of the RV in the same compartment with the water and electric hookups. There should be 2 lines, one that is almost twice the diameter of the other. The larger line is for black water and the smaller one is gray water. You should always drain the black water tank first so that when you drain the gray water it flushes the really nasty stuff from your drain hose.
If it is a big valve it is your sewer tank drain valve. There is two valves. One is the Black water drain and the other is the gray water drain. the black water drain comes from the toilet holding tank, and the gray water valve drains the shower and sink holding tank.
The statement is extremely vague. Is it a travel trailer or a motor coach? Motor coach could be dripping condensation from ac while in use. Is it fresh water and only leaks when connected to a hydrant? Does it only leak when sewage is dumped into the black water holding tank? In short, you must determine under what condition the unit is leaking. Then narrow down where it is leaking from and then identify the failed part. RV manufacturers do not publish plumbing diagrams so it is all visual in the diagnostic process.
Fresh water holding tank will have a single 1/2" line hanging down under the trailer. It will have either a cap or a valve. To drain open the valve or remove the cap. For gray water and black water you must be connected to an approved dump site with an approved RV sewer line. Open the 3" valve first and allow the black tank to drain then open the 1-1/2" valve to drain the gray water. This will flush the sewer line as well.
No diagrams available. There should be a tank located under the trailer with a water fill point on the outside of the trailer. Inside under a cabinet there should be a demand pump with an on/off switch located on the monitor panel. There may be a winterizing three way valve between the tank and the pump with a third open ended line used to draw antifreeze into the system. If the valve is in the wrong position the pump will not prime and distribute the water as designed. From there the pump is plumbed into the rest of the plumbing system.
There are four sensors in the side of the tank. When they get blocked with scum they will give a false reading. Thetford makes a product called level gauge cleaner that you can pour into the gray water holding tank through the sink and tub/shower drains that will clean the sensors. There is also a product called Unique that is pretty good at cleaning. Try using one of these products, if that does not work then you may have to replace the sensors.