burlmart - I have a similar 2 solenoid enclosure as your unit, but I really have no idea which one does what. I do know I have no 12 volt in my coach if I place the coach battery in "stor" mode. That is true whether the van engine is running or not. I also cannot charge the coach battery with the engine unless I put the coach battery in the "use" mode.
A couple years ago, the coach battery was almost totally discharged when I picked up the RV from storage. Plugged the RV into shore power at home, turned on the fridge on 120V. Forgot to put the coach battery in "use" mode. I was thinking shore power was charging the coach battery. Left home for a trip and after about 3 hours noticed that the fridge light was flashing. I then realized the coach battery was not connected. The coach battery was dead. Used jumper cables from the engine battery to the coach battery and placed the coach battery in "use" mode. Started the engine and all was well. About 4 more hours of driving charged up the coach battery.