2014 Bighorn 3875FB: cant determine which gate valve dumps the front toilet

[Jward]

Just bought a 2014 Bighorn 3875FB, and can't get the front black tank to dump. Been full timing for 4+ yrs, so am familiar with the dumping process. The spec sheets and owners manual all say that I have two Grey, but only one black tank. But I have 4 cable pulls for 4 valves (not happy about these cable pulls, compared to what I had on my Southwind). I've attached pics of my setup, please advise!!

 

[JohnDar]

If you’re sure there’s water in the tank and nothing comes out when you pull the valve handle, it’s possible that the valve is not opening or there’s a plug/debris at the tank opening. To determine which valve is for which tank, add some food coloring to it and put a clear adapter on the sewer connection.


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[Kathi-27]

when we had our bighorn fb and our now landmark fb they are the same as your pic. top is the shower gray tank, mid is front bath black tank , bottom is 1/2 bath black tank. the outside access door with a pull handle gray 2 for the kit galley gray tank.

 

[david-steph2018]

Just bought a 2014 Bighorn 3875FB, and can't get the front black tank to dump. Been full timing for 4+ yrs, so am familiar with the dumping process. The spec sheets and owners manual all say that I have two Grey, but only one black tank. But I have 4 cable pulls for 4 valves (not happy about these cable pulls, compared to what I had on my Southwind). I've attached pics of my setup, please advise!!

The easiest way I can tell you to determine which is which, use food coloring. Get a couple of different colors, mix in a 5-gallon bucket and dump in the toilets.
Hint: write down what color you dump where, so there is no doubt when you dump.