Did some things since last time:
* installed Blue Sky 2512ix with ipn proremote and 500amp shunt (no solar yet)
* rewired main battery lines with somewhere between 1 and 0 AWG (actually European 50mmยฒ) together with the shunt of the 2512ix
* replaced bad battery (now have 2 Trojan 27TMX batteries instead of one with an other brand marine battery, which came with the RV when I bought it)
* camco cyclone vent on grey water tank (result unknown at this time)
The maxxair vent covers with opened vents, ofcourse, pull air out of the interior and if the under-pressure gets too big, it sucks air through the P-traps, through the grey water tank and through the tank vent where fresh air is sucked inside. By doing that the interior fills itself with grey water smell. By installing a cyclone vent, I assume that the tank and interior will get about the same under-pressure, so it won't try to suck air through the tank vent and P-traps anymore. Before installing that I tried just about anything, like opening a window a little, half, all the way, window in the front, window in the back, one roof vent open, another vent open, both vents open,... I also searched here and that's how I found the cyclone vent solution. Hope it works.
2001 Ford F350 7.3 Diesel (DRW Crew cab Long bed)
Sonnax TQ and Sonnax 4R100 rebuild - 6.0 transmission cooler and OTW cooler.
2011 Arctic Fox 992 - 2.5kW propane generator - 315AH Trojan batteries - 2kW pure sine wave inverter - 140Wp solar