l would contact TIFFIN Allegro Bus with photos and location of the component.
Being only two connections marked BAT and AUX I would lean towards a BATTERY SYSTEM component and most likely a DIODE BASED ISOLATOR. However most DIODE BASED ISOLATOR requires THREE LARGE CONNECTIONs if used in the POSITIVE TERMINALS of the battery systems..
This could very well be high current AUTO RESET RELAY CONTACTOR.
I have been scanning the internet without any good results. Was even able to look through a couple of USER MANUALS PDFs for the Tiffin Allegro Bus.
I am just guessing like all the others here...
Roy Ken
