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Zack&Rachel- What year is your coach? I agree with Garry Wolfe that something else is plumbed into the black tank, like maybe your shower. My inlaw's '18 Alpine had the shower plumbed into the black tank and with the help of my trusty inspection scope I validated that indeed it was by running the shower with the scope down inside the black tank (via the toilet) I saw the water pouring in. WE went to our trusted RV service center (not Caming Planet) andthey talked to Keystone and Keystone acknowledged that it was a mistake and paid for the repair. IF you don't have a scope I would empty the black to the point that I know it's empty and then run the sinksks and showers to see if it's filling upvia the indicator or flashlight down the toliet. Good luck and post back if you figure it out!
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