Black tank vent
Exhaust fan should be blowing air out on roof when running. If it's off, open, and close to the vent, and some other vent is blowing air out of AS, stink happens...
If it's like mine, to close it, turn it off, and pull the handle down to shut the cap.
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Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.