Hello. Can anyone tell me where I can find a plumbing schematic for a 2016 GS Ameri-Lite 268BH? By all appearances I strongly believe that our shower & toilet are plumbed to the black tank & only sinks to the grey tank. If it isn't too difficult to do, I am strongly thinking about replacing the shower to the grey & bathroom sink to the black. We are the 2nd owner & are finding little things as we go. Owner manual is useless. Also would like to find wiring schematic. Sound system works intermittently and outside door light not at all (yes, I checked the bulb). Thanks for any & all help. Much appreciated.