"Black 1" or "Black 2" on the monitor panel?

[Road KaTz]

I have recently purchased a used 2015 Keystone Carbon 297. I am having trouble determining whether my ONE black tank is "Black 1" or "Black 2" on the monitor panel. They both read some level of content, so I can't tell - and I do realize that tank sensor issues seem to be prevalent in these trailers. Does anyone by any chance know which Blank tank indicator I should be reading for my model??

[ken56]

I would guess black 1. I have the two tank buttons also and my black 2 always reads empty because there is not 2 black tanks.

[sourdough]

To be sure, pull the drain handle and drain it. Run water in it until your "indicator" reads more than it did....THAT is the monitor to look at. Or, if you only have one black tank, forget it. The tank will tell you when to dump and after you've done it a while you won't even think about the monitor...I forget I even have one.

[Road KaTz]

Thanks, Ken56. I'll check it again.

[Road KaTz]

Thanks, sourdough. Will try that, and will keep a close eye on it to see how long it takes for it to get truly close to full on my next run.