[RayChez1]

I do not have a Sun Voyager, but on my Scenic Cruiser my shower, and both sinks and the washer go into the grey tank. Only thing that goes into the black tank is the toilet water.

But I have read on other forums where some have put a bypass to where they can allow water from the grey into the black so that both tanks fill up together.

I would not want that system on my coach.