Don't believe such an item exists in the RV industry--you are going to have to do some circuit tracing, or get an RV tech to help you. And keep the family members out of the mix...
Wishing you much luck, electrical issues can be tough for most of us.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired