That might be it near the floor on the edge of the sink cabinet. It usually is part of the circuit breaker and fuse cabinet in the bottom compartment...
It is called a Power Converter which provides your 12VDC for your 12V items when plugged into shore power and also is the battery charger.
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS