Ouch, sorry to hear that. Unfortunately coach is in storage so can't get to it and I can't remember if they are parallel or series connection. Guarantee if you post on https://www.irv2.com/forums/f107/
the Fleetwood forum you will get an answer pretty quick.
Hi, Yes on a long drive the rear bath floor becomes a "heated" floor with the engine right underneath, but not a big issue. We love our Disco, coming out of a Bounder previous. Alot of coach for the money. Hope the USB>HDMI cable works for ya. Any questions just hollar! Rgds/Brian