I believe the FB model has a bath and a half, and thus two black tanks (apparently). But the OP didn't ask about black tanks. He asked if the two grays are connected as nothing has dumped out of one of his gray tanks.
If they are 'connected', it's news to me and most CC owners. So I suspect you have another problem of some kind.
My suggestion would be to pour a ton of water into the shower..........and another ton into the kitchen sink......takes a while. Then go pull one gray tank valve handle and see what happens. Close it.......and THEN open the other gray tank valve and see what happens.
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"Next to prayer, fishing is the most personal relationship of man" Herbert Hoover
"American by Birth, Southern by the Grace of God"Lewis Grizzard
FROG AR-0019-242
2016 GMC Denali 3500Dually--2017 CC 36CKTS
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